The Socio-political Embeddedness of Legal Norms

The socio-political embeddedness of international criminal justice points to two potential explanations of the question why the ICC and other international tribunals have interpreted and applied the individual criminal responsibility principle differently: that powerful states have sought to constrain the mandate of the ICC and that the differences in the professional backgrounds of ICL academics and lawyers has created clashes in the interpretation of legal principles. To begin with the first explanation, the ICC and the UN tribunals were designed differently. The statutes of the UN tribunals ^{Footnote 11} were significantly less detailed compared to the ICC’s Rome Statute, which left more room for judicial creativity to the judges at the UN tribunals compared to their colleagues at the permanent court. The level of judicial independence that the ICTY was granted has been explained by the seeming confidence of the UN Security Council’s member states in the low probability that any of their nationals would be prosecuted by those tribunals (Danner Reference Danner2006, 19–20). However, the Security Council had a different predisposition toward the ICC. Unlike the ICTY and the ICTR, whose jurisdiction was limited to addressing specific instances of mass atrocities, the ICC constitutes a permanent institution that could potentially prosecute crimes committed worldwide. Consequently, authoritative commentators have noted that, during the establishment of the ICC, states have sought to constrain the future court to a far greater extent than the UN tribunals (Cassese Reference Cassese, Cassese, Gaeta and Zappalà2008, 526). To protect their nationals from prosecution at the permanent international court, the argument goes, powerful states have curbed the freedom of action of ICC judges by drafting in significant detail the Rome Statute (Hunt Reference Hunt2004). Darren Hawkins and colleagues (Reference Hawkins, Lake, Daniel and Tierney2006, 29–30) suggest that, as a result of “fears of a runaway international court,” states have limited the discretion of the ICC, for instance, by the Rome Statute’s “complementarity” provision, which enables states to challenge the court’s jurisdiction by genuinely investigating the crimes at the domestic level.

While there is certainly merit to this observation, it is usually made in a rather generic manner that obscures the complexities of the dynamics taking place inside the ICL field. States remain highly influential actors in international relations, but modern interdisciplinary analyses have highlighted that states are not the only, or perhaps not even the most authoritative, actors in the field of international law (Helfer and Slaughter Reference Helfer and Slaughter2005; Alter Reference Alter2014). Nicole Deitelhoff’s (Reference Deitelhoff2009) study highlights the significant role played by NGOs, supported by a group of small- and middle-state powers, in countering the highly constrained project design of the ICC, which was originally supported by the permanent members of the Security Council, and in lobbying for some limited freedoms for the ICC judges and the prosecutor (see also Hall Reference Hall2004, 125).

This article similarly examines the interplay of interests and ideas in the ICL field by providing two types of further insights. First, the interdisciplinary literature has extensively examined the influence of states and NGOs during the drafting of the Rome Statute’s provisions concerning the court’s jurisdictional scope, including its “complementarity” mechanism (De Vos Reference De Vos2020) and the powers of the prosecutor (Deitelhoff Reference Deitelhoff2009). However, the role of state and non-state actors in drafting the individual criminal responsibility provisions in the ICC’s statute has attracted less scholarly attention among international relations scholars, despite the significance of that part of the statute for fulfilling the court’s mandate. Second, Deitelhoff’s study as well as other studies depict a continuous struggle between, on the one hand, powerful states seeking to protect their sovereignty and, on the other hand, non-state actors, supported by small- and middle-state powers, promoting “the fundamental principles of law” over state interests (60). While there is merit to this account, it neglects the lack of a consensus within the ICL field over defining the precise requirements of the fundamental principles of law. The question whether state sovereignty or international law should take precedence might be one source of contestation in ICL, but the purpose, requirements, and goals of international law are similarly disputed among legal scholars and practitioners. Assuming there is a dichotomy between “state interests” and “legal principles” in ICL suggests the existence of an objective legal order that cannot be located anywhere and removes international legal principles from the realm of contestation.

The legal scholarship on international criminal justice has provided another insight into the reasons why the individual criminal responsibility principle has been construed differently across time and space—namely, that the ICL field has integrated legal experts with different legal backgrounds, which may sometimes result in clashing interpretations of legal norms. Most prominently, the work of Darryl Robinson (Reference Robinson2020, 22–24) and other scholars has highlighted a schism between those ICL practitioners with a background in public international law, such as international humanitarian law and human rights law, and those with a background in domestic criminal law. These branches of law significantly differ in terms of their purpose, guiding principles, and the methods they use to interpret legal provisions. ^{Footnote 12} Scholarly work has also observed that the practices of assessing criminal responsibility somewhat vary across domestic penal systems, such as the Anglo-Saxon system and the continental system (see van Sliedregt Reference Van Sliedregt2012). Because the ICL field integrates criminal lawyers with professional background in a variety of national penal systems, it makes reaching a consensus on the appropriate requirements of the individual criminal responsibility principle particularly challenging.

This article seeks to contribute to these scholarly observations by providing new insights into the dynamics taking place in the ICL field. Specifically, this article explores the constant (re)construction of the modes of liability in ICL by taking into consideration two factors. First, I will examine the interaction between different ideas about the law or, in other words, the combined impact of the “common law versus civil law” and the “international law versus criminal law” cleavages on the conceptualization of the modes of liability in ICL. Second, I will explore the institutional context that provides the arena for the competition of ideas to take place. The establishment of the ICC was marked not only by a shift in the position of states—from expressing little interest in the statutes of the UN tribunals to becoming actively involved in the design of the ICC—but also by the unprecedented participation of NGOs and legal experts.

The rest of this section presents a framework of analysis, which borrows from “practice” studies to explain the construction of legal norms and ideas. The following section relies on this framework to analyze the construction and application of the modes of liability in the ICL field.

International Law: A Dynamic Phenomenon

Borrowing insights from Friedrich Kratochwil (Reference Kratochwil1989) and Jutta Brunnée and Stephen Toope (Reference Brunnée and Toope2010, 22), this article approaches international legal rules as “continuing struggles of social practice” (see also Johnstone Reference Johnstone2011), where “social practice” means “socially meaningful patterns of action” that guide interaction within epistemic communities (Adler and Pouliot Reference Adler, Pouliot, Adler and Pouliot2011, 6). Inside the legal domain, social practices comprise the application of legal rules to the case at hand and the process of appraising the reasons given for a particular decision before the community of legal practice. This pattern of rule following distinguishes social practice in the form of legal reasoning from other social practices, such as political and moral judgments (Kratochwil Reference Kratochwil1989, 18).

Practice studies enable the researcher to trace the interaction between the structure of the legal field—the rules of practice—and the actions of the agents within that field. The rules of legal practice are not to be found in a perfect legal code but are instead reproduced in the everyday application of those rules within the epistemic community of international law (see Adler and Pouliot Reference Adler, Pouliot, Adler and Pouliot2011, 17). At any point in time, the participants in that epistemic community are bound by “shared understandings” concerning the appropriate interpretation and application of legal rules, which they use as guidelines to assess the validity of legal reasoning (Brunnée and Toope Reference Brunnée and Toope2010, 24). In a similar manner, Jürgen Habermas (Reference Habermas1996, 226–27; emphasis in original) describes the law as a form of an “argumentative process.” This framework of analysis locates the source of validation of legal rules neither in abstract moral philosophy nor in state compliance but, rather, in social practice (see also Johnstone Reference Johnstone2011, 35).

The “standards of competence” of the legal field that guide the practice of international law are constantly being “renegotiated” within the legal epistemic community (Adler and Pouliot Reference Adler, Pouliot, Adler and Pouliot2011, 15–17). While individual legal decisions remain bound by the pre-existing standards of competence recognized by the epistemic community, members of that community can nevertheless take action to promote new interpretations of legal rules (Bourdieu Reference Bourdieu1987, 839). Yet any revisions of the background know-how of the epistemic community are not random and are unlikely to introduce entirely new rules of practice. Instead, reforms in social practices usually constitute modifications of the already existing standards of competent performances (Fish Reference Fish1980, 349).

Notably, some actors within the community of legal practice would possess more power over the discourse than others (Zehfuss Reference Zehfuss2002, 148). Social practice can reproduce different forms of discrimination present in society (Brunnée and Toope Reference Brunnée, Toope, Adler and Pouliot2011, 112), a problem that has long ago been recognized by feminist scholars highlighting the unequal “dialogical capacities” of women and men to influence “public opinion” (Fraser Reference Fraser1985, 116). Similarly, in the international legal arena, some states have been “disproportionately influential” (Brunnée and Toope Reference Brunnée, Toope, Adler and Pouliot2011, 119). States, in general, despite the significant power disparities among them, remain highly influential actors in the field of international law, not only by exerting control over the international courts’ budgets and the (re)election of judges but also by their ability to question an international court’s reasoning and delegitimize its authority (Helfer and Slaughter Reference Helfer and Slaughter2005). But while state power inequalities certainly play a role in the international legal field, the dynamics taking place in the latter are more complex and involve a greater range of actors. This is because the form of politics that enters the international legal field is “constrained and shaped” by the background rules of the international legal epistemic community (Abbott and Snidal Reference Abbott, Snidal, Dunoff and Pollack2013, 35). Because the revision of the background rules of legal practice constitutes an incremental process, even great powers cannot simply replace the law with a new one that serves their interests (Johnstone Reference Johnstone2011, 52). Therefore, a different type of power dynamics take place within the international legal field—the “competition for monopoly of the right to determine the law” (Bourdieu Reference Bourdieu1987, 817). Expert knowledge, or “knowledge of the rules” of practice (Fish Reference Fish1980, 343), thus, becomes the key source of power and authority within the epistemic community of international law (Bourdieu Reference Bourdieu1987, 816).

The centrality of expert knowledge inside the international legal field grants significant authority to determine the acceptable interpretations of legal rules to non-state actors, such as judges, legal experts and NGOs. Thirty-five years after Pierre Bourdieu (Reference Bourdieu1987, 834–35) observed the “professional monopoly” over the provision of legal interpretations instituted by lawyers and legal experts, his comments seem more relevant than ever. The “invisible college” of international lawyers has become a well-known term to describe the growing community of academics and practitioners actively voicing their opinions on matters of international law (Schachter Reference Schachter1977–78, 217). To present their ideas nowadays, legal experts rely on publications in leading academic journals, which have become particularly influential in the field (Vasiliev Reference Vasiliev2015, 703), academic blogs, and even social media. In the ICL field, Mikkel Jarle Christensen (Reference Christensen2017, 246) observes that judges often rely on academic writings to validate their interpretation of legal rules in the case at hand. NGOs have also been active participants in the ICL field. Over the past two decades, NGOs have not only championed the establishment of the ICC and promoted ratification among states but also strictly monitored the work of the court and demanded efficient administration of justice (Schiff Reference Schiff2008, 144).

Overall, “practice” studies offer important insights into international legal decision making—namely, that the international legal arena is governed by specific rules, or “standards of competence” of legal reasoning, and involves a variety of actors claiming authority over legal decision making in accordance with those standards. The variety of actors within the international legal field implies a variety of interpretations of international laws, premised on different visions of the purpose of law in society. Nevertheless, novel approaches to international law do not come “out of nowhere”—rather, they are non-deliberatively developed with respect to the background knowledge of the field and need to gain at least some traction, or social validation, among actors within that field. The next section applies this framework to the subfield of ICL and, specifically, to questions pertaining to the development of modes of liability.

Standards of Competence in the ICL Field

The ICL community of practice has coalesced around the idea that the perpetrators of mass atrocities, including genocide, war crimes, crimes against humanity, and aggressive war, bear personal responsibility and should be punished for their conducts (Sikkink Reference Sikkink2011, 162–63). But ICL does not just recognize any form of punishment as acceptable—the idea of summary executions was rejected by the United States in the aftermath of the Second World War (Drumbl Reference Drumbl2007, 3). Franklin Roosevelt’s secretary of war, Henry Stimson, reportedly argued that the defeated Nazi generals had to be put on a legitimate trial to reflect the United States’s own domestic recognition of fair legal procedure (Bass Reference Bass2000, 148). Thus, the Western “liberal” trial came to be recognized as the legitimate form of punishment for international crimes (Bass Reference Bass2000, 24; Sikkink Reference Sikkink2011, 13). As observed by Elizabeth Borgwardt (Reference Borgwardt2007, 205), the Nuremberg trial reflected the projection of “peculiarly American, New-Deal-style” ideas of justice onto the international arena.

Regarding the accepted forms of punishment, unlike other branches of international law, which typically concern state behavior, international criminal justice has the authority to hold individuals accountable. Consequently, ICL is premised on the specific legal norms protecting the defendant’s rights that are common to domestic penal systems but absent from other branches of international law. The “principle of legality” stipulates that an individual can be punished only for a conduct that has been unambiguously criminalized at the time of its commission (Gallant Reference Gallant2008, 11–12). The principle of “personal culpability” requires that persons can only be punished for their own conduct, and it protects individuals from being punished for mere association with the wrongdoers (Danner and Martinez Reference Danner and Martinez2005, 85). The culpability principle essentially requires evidence that the accused had consciously or intentionally made some contribution to the commission of the crime.

These criminal law norms have been applied in a novel context in the international law field, raising questions about their appropriate interpretation and application. The context was novel mainly because of the different nature of international crimes and domestic crimes. International crimes often constitute mass atrocities that involve hundreds or even thousands of perpetrators and are said to be facilitated by a social climate of fear and hatred. This social climate “authorize[s]” conduct that would be considered delinquent behavior under normal circumstances (Kelman Reference Kelman, Nollkaemper and Van der Wilt2009, 36; emphasis omitted). Mass atrocities, thus, are often orchestrated or incited by a higher authority. Consequently, the individuals that are considered the “most responsible” for international crimes are often the leadership figures who have orchestrated their commission from above. But to establish a link between the person at the top and the actual criminal conduct is a challenging task.

The efforts to operationalize the legal norms associated with individual criminal responsibility, such as the modes of liability, in the novel context of international law resulted in an emerging community of ICL practice. This community attracted participants from a variety of legal backgrounds, who brought specific background understandings of what constitutes a competent legal performance. Due to the initial scarcity of “international criminal lawyers,” as observed by Robinson (Reference Robinson2020, 22–24), the development of ICL at the UN tribunals was largely led by experts in international human rights law and international humanitarian law (IHL). Judges with experience in human rights promotion have played a crucial role in the development of greater protection for the victims of international crimes, such as gender-based crimes, at the ICTY and ICTR. Examples include Judge Elizabeth Odio Benito, Judge Gabrielle Kirk McDonald, Judge Florence Mumba, and Judge Navanethem Pillay.

However, human rights law and IHL have a different purpose and, consequently, hold different understandings of the appropriate legal sources and procedures compared to criminal law. Criminal law places the burden of proof on the prosecution and protects the defendant’s rights. The “rule of lenity” in criminal law requires that any ambiguities at trial should be resolved in favor of the defendant (Van Schaack Reference Van Schaack2008, 121). This defendant-oriented nature of criminal law is justified with the harshness of the punishment imposed—deprivation of personal freedom or even the death penalty in some systems (Danner and Martinez Reference Danner and Martinez2005, 86–88). By contrast, as observed by Allison Danner and Jenny Martinez, human rights law and IHL focus on preventing or recognizing the victims’ suffering and allowing broader interpretations of legal principles to ensure that harm is addressed. Unlike criminal law, human rights law sanctions do not include incarcerating individuals but, rather, mechanisms such as public shaming and symbolic findings of state wrongdoing (86–89). In those subfields of legal practice, it is acceptable to evoke moral considerations, such as “the laws of humanity, and the dictates of the public conscious” when determining humanitarian obligations. ^{Footnote 13} By contrast, in criminal law, the legality principle—namely, the requirement of providing fair notice of legal prohibitions to society—precludes the reliance on such broad concepts as “morality” and “public consciousness” in assessing criminal responsibility.

Another contributor to the plurality of norms within the ICL field is the difference in practices that can be observed among criminal lawyers. Common law generally relies on pragmatism or common sense, while civil law systems adopt a highly systematized and theoretically developed approach to criminal law (Trechsel Reference Trechsel2009, 26–27). The “pragmatic” approach has historically led some common law systems to apply less strictly the culpability principle in cases of group criminality and to grant lesser significance to the legality principle. By contrast, civil law systems tend to codify in detail the fundamental legal principles valid for all crimes into the so-called “general part” of criminal law, which is considered to provide greater clarity about the requirements of the law and, thus, greater compliance with the legality principle (Gallant Reference Gallant2008, 13, 33–35).

As the next subsection discusses, different international tribunals have taken different approaches, with the post-Second World War and post-Cold War tribunals applying less strictly the culpability principle compared to the ICC. Ideas about the moral significance of punishing the perpetrators of mass atrocities, even when the link between those persons and the crimes is tenuous, have influenced the jurisprudence of the 1945 Nuremberg tribunal, the ICTY (established with UN Security Council Resolution 827 in 1993 during the conflicts in the former Yugoslavia), and the ICTR (established with Resolution 955 in 1994, following the Rwandan genocide).Footnote ¹⁴ But the ideas of criminal lawyers, and especially those of civil law countries who respect the strict application of the legality and culpability principles, have become particularly influential at the ICC.

Nuremberg and the UN Tribunals

Both the Nuremberg and the UN tribunals borrowed from humanitarian ideas of morality and public consciousness to set in motion the project of international criminal justice. More specifically, these tribunals based their practices on the premise that, due to the unique nature of mass atrocities, the criminal law principles used in domestic systems could not be applied in the traditional manner in international law, lest the perpetrators of those atrocities were “allowed to go unpunished.”Footnote ¹⁵ This required a special approach to delineating the guilt, or culpability, of the individuals standing trial for mass atrocities. Specifically, to assess the accused’s criminal responsibility, the judges at those tribunals often relied on establishing an indirect link between the accused and the crimes—the accused was linked to the collective entity that planed or engaged with criminal activities rather than directly to the commission of those crimes. Thus, the Nuremberg tribunal convicted former Nazi officials for either participating in a “conspiracy” to wage an aggressive war or for being members of a “criminal organisation” (see Yanev Reference Yanev2015). In a similar manner, in the 1990s, the ICTY developed the theory of JCE, which became widely used at the tribunal. Pursuant to JCE, the prosecutor did not have to prove that the accused had personally committed the crime but only that they had provided “assistance in, or contribution to, the execution of the common purpose” of the criminal enterprise, which had resulted in the commission of the crime.Footnote ¹⁶ One of the variants of JCE set such low requirements for the attribution of criminal responsibility that the accused could be convicted for a crime that fell outside the scope of JCE’s common purpose if that crime was committed by one of the group’s members and was merely “foreseeable” by the accused.Footnote ¹⁷ The ICTY and ICTR’s interpretation and application of the “command responsibility” principle—namely, holding superiors criminally responsible for failing to address the crimes of their subordinates—has triggered similar concerns for expanding the scope of personal culpability (Damaška Reference Damaška2008, 350). Specifically problematic appeared to be the tribunals’ finding that command responsibility did not require a causal connection between the commander’s inaction and the crimes (Robinson Reference Robinson2020, 146). One authoritative commentator called command responsibility “the silver bullet of the prosecution” (Schabas Reference Schabas2007, 222).

This broad interpretation of the culpability principle at Nuremberg and the UN tribunals sometimes came “dangerously close” to abrogating the culpability principle by obfuscating the accused’s personal contribution toward the crime (May Reference May2008, 266). This approach was premised on two sets of background understandings of the scope and function of legal norms dominating the ICL field at the time: the human rights/humanitarian logic of taking into consideration the interests of victims and the society at trial and the common law practice of relying on broad theories of group criminality. The justification of theories such as JCE revealed a humanitarian concern to serve justice to the victims and prevent the perpetrators of mass atrocities from escaping punishment by exploiting the limits of the culpability principle. One authoritative judge at the UN tribunals argued that the creative interpretation of the concept of “culpability” found in JCE was “necessary” for the fulfilment of the ICTY’s “mission to administer international criminal justice” (Shahabuddeen Reference Shahabuddeen, Darcy and Powderly2010, 197).

The ICTY’s first president Antonio Cassese and colleagues (Reference Cassese2009, 294) argued that JCE served to prevent individual perpetrators from escaping criminal accountability by hiding behind “the fog of collective criminality.” The approach of Cassese, a highly influential figure in ICL, has been described as one “that sought to move the law forward and render it more humane,” possibly reflective of his earlier interest in philosophy and the humanities (Cryer Reference Cryer2012, 1048). JCE was useful for holding criminally responsible those persons who were not directly involved in the crimes, especially leadership figures. From this humanitarian perspective, the culpability principle cannot be interpreted the same way in ICL as in domestic systems because many persons would escape punishment due to the difficulties of delineating each individual’s contribution to the mass atrocities. Echoing the understandings shared within the human rights and IHL communities of practice, the ICTY judges considered that the preservation of justice and fairness toward the accused had to be “balance[d]” against “the preservation of world order.”Footnote ¹⁸

An additional factor that influenced the jurisprudence of international tribunals was the spread of common law practices. The United States exerted significant influence over the process of developing the legal theories that were used at Nuremberg to link the accused Nazis to the crimes. The original idea that the prosecution of Nazi crimes required special theories of liability, such as conspiracy and membership in criminal organizations, to reflect the collective nature of those crimes was that of US Colonel Murray C. Bernays (van Sliedregt Reference Van Sliedregt2012, 22–23), described as “the thoughtful and bookish chief” of the Special Projects Office in the War Department (Borgwardt Reference Borgwardt2007, 221). The US Secretary of War Henry Stimson reportedly endorsed the idea because he had personally relied on the concept of conspiracy when practicing as a young lawyer (222). Another American—Robert Jackson, the head of the US delegation to the London conference and future chief US prosecutor at Nuremberg—reportedly became the “main force” behind the inclusion of the conspiracy charge in the Nuremberg Charter,Footnote ¹⁹ albeit in a somewhat different version from Bernays’s original idea (Yanev Reference Yanev2015, 434). Thus, the development of the first modes of liability in ICL has been significantly influenced by the ideas shared among US officials in the postwar period. In common law, the idea of “conspiracy” seemed less controversial than in civil law. It is telling that several years after the Nuremberg judgment, the Pinkerton conspiracy became an accepted doctrine in US domestic law (429).Footnote ²⁰

Those ideas did not remain uncontested. During the 1945 London negotiations, the French and the Soviet representatives who were trained in civil law reportedly expressed strong disapproval of the broad concept of conspiracy that diluted the link between the accused and the crime (Dubber Reference Dubber, Reimann and Zimmermann2006, 1323). But the US delegation insisted on including the conspiracy charge in the Nuremberg Charter (van Sliedregt Reference Van Sliedregt2012, 23). The uneasiness displayed by some members of the nascent ICL community, and especially the French judge at Nuremberg, Donnedieu de Vabres, with the concept of conspiracy has not been inconsequential. In fact, that uneasiness has often been quoted as the reason behind the limited reliance on the conspiracy charge in the final Nuremberg judgment (Gallant Reference Gallant2008, 117; Yanev Reference Yanev2015, 444). Nevertheless, the influence of common law ideas has had a long-lasting impact on the development of modes of liability in ICL. The ICTY Appeals Chamber, which established the JCE theory referred to the jurisprudence of the post-Second World War UK and US military courts and to the US Pinkerton doctrine in support of the existence of JCE.Footnote ²¹ Like at Nuremberg, this trend has been explained in part by the fact that, in the early years of the tribunal, many ICTY judges and legal officers were trained in common law (Steer Reference Steer, van Sliedregt and Vasiliev2014, 45).

But, over time, as the ICL system developed and its community of practice began to attract practitioners from a broader variety of professional backgrounds, the assumption that conspiracy- and JCE-like modes of liability were appropriate for addressing mass atrocities became problematic. Legal scholars and practitioners with extensive professional background in civil law systems, including in Germany and the Netherlands, strongly advocated for reforming JCE or for substituting it with a different theory of criminal responsibility. Examples of those ideas include the writings of Kai Ambos (Reference Ambos2007, 171–73) and Harmen van der Wilt (Reference Van der Wilt2007). Premised on a narrower interpretation of the culpability principle, the critics of JCE and specifically of its broadest articulation “JCE III,” expressed concern that convicting a person for crimes that were merely “foreseeable” risked the attribution of liability without evidence of personal culpability (Ambos Reference Ambos2007, 174).Footnote ²² From this perspective, JCE treated so many persons as potential perpetrators that the doctrine experienced difficulties explaining “why each fish caught deserves punishment for intentional wrongdoing” (Weigend Reference Weigend2008, 477). One ICL expert with significant experience in the Egyptian justice system, Mohamed Elewa Badar, famously called JCE III a theory developed to “just convict everyone” (Badar Reference Badar2006). Overall, many critics of JCE share familiarity with civil law concepts, extensive professional background in criminal law, and concern for overstretching the culpability principle.

Some criticism of JCE was also voiced inside the UN tribunals, especially from judges with a civil law background. A notable example was the Stakić case. In 2003, an ICTY chamber chaired by Judge Wolfgang Schomburg, previously serving at the German Federal Court of Justice, tried to substitute JCE with a German-influenced theory of criminal responsibility, arguing that the latter was more compliant with the principles of legality and culpability.Footnote ²³ It is possible that at least one more of the Stakić trial judges—namely, Judge Carmen Argibay from Argentina—was familiar with the proposed German theory of criminal responsibility, developed by Claus Roxin. That theory had been employed by Argentinean courts in trials against members of the Junta regime (Ambos Reference Ambos2007, 182). The attempts to substitute JCE with the German theory remained unsuccessful at the UN tribunals because JCE was “routinely applied in the Tribunal’s jurisprudence” and its substitution would have generated “uncertainty, if not confusion” about the applicable law.Footnote ²⁴ JCE had already became an established practice at the UN tribunals, which most judges were reluctant to change. But, as the next section discusses, the German criminal law practices became significantly more influential at the ICC.

Drafting the Rome Statute

The unique context of the ICC’s creation enabled different know-how ideas to become involved in the development of ICL, which brought up modifications in the social practices of the field. The establishment of the ICC and the drafting of its Rome Statute provided a forum for contesting the old practices, or socially meaningful patterns of legal reasoning, that had previously dominated ICL and for presenting new ideas concerning modes of liability. For the first time in ICL, a plurality of states, legal experts from different backgrounds, and hundreds of NGOs participated in the drafting process. Furthermore, the stakes of influencing the ICC’s founding document were particularly high. As the statute of “the first permanent general, future oriented international criminal court” (Kaul Reference Kaul2012, 5), the Rome Statute was bound to play a more profound role in the ICL field than the statutes of the temporary UN tribunals (van Schaack Reference Van Schaack2008, 170).

A major novelty of the Rome Statute was that it included a section called “General Principles of Criminal Law,” which included the applicable modes of liability (Preparatory Committee 1996, 41–47). Article 25(3)(a) of the Rome Statute specified in detail a limited number of situations in which a person could be found guilty of committing a crime—namely, committing a crime personally (direct perpetration), jointly with others (co-perpetration), or by using other persons as tools to physically commit the crime (indirect perpetration).Footnote ²⁵ Furthermore, for the first time in ICL, the Rome Statute defined criminal intent or the “mental element” of personal culpability. Article 30 of the Rome Statute required that the accused “mean[t] to engage” in the crime or was “aware that it will occur in the ordinary course of events” as a result of her actions. Hence, unlike the statutes of previous tribunals, the Rome Statute introduced a system of highly detailed rules for assessing the guilt or innocence of the accused.

The comprehensive codification of criminal law principles in the Rome Statute has sometimes been perceived as an attempt by states to limit the independence of future ICC judges and avoid the legally controversial practices of previous tribunals (Hunt Reference Hunt2004, 61). This proposition is in line with the rationalist principal-agent model of delegation in international relations, according to which the greater the specification of the rules of operation of the international organization, the greater the control of the principal (the states) over the agent (the court) (Hawkins et al. Reference Hawkins, Lake, Daniel and Tierney2006, 27). There is certainly merit to such arguments. The drafting records show that some states favored a flexible ICC statute that would have enabled the judges to elaborate the applicable modes of liability, but most states preferred that the fundamental criminal law principles were clearly articulated in the statute to avoid conferring “substantive legislative power” to the future ICC judges (Preparatory Committee 1996, 42).

But while most states may have preferred a more constrained court, it would be simplistic to attribute the Rome Statute’s general part only to sovereignty interests and to ignore the variety of competing understandings among legal experts about what the future ICC statute should look like. The absence of codified general principles at previous international tribunals was influenced by the United States’s important role in their establishment and the common law preference for pragmatism over the systematization of the law (Ambos Reference Ambos2006, 661). However, in the 1990s, many authoritative civil law scholars, including the German scholars Albin Eser and Kai Ambos, called for the categorization of the principles of criminal law within a “general part” of ICL (see Eser Reference Eser1993; Ambos Reference Ambos1996). That proposition was also supported by the influential Siracusa draft of the ICC’s statute, produced by legal experts in 1995–96 in Italy.Footnote ²⁶ While the codification of ICL principles might have reassured some states that their nationals would be protected from judicial creativity, the general part constituted for civil law practitioners a necessary component of a criminal code, especially at the international level (Saland Reference Saland and Lee1999, 191; Eser Reference Eser2001, 20). Instead of constraining the court and benefiting states, the codification of the principles of criminal law within the Rome Statute constituted for some scholars a safeguard against the infiltration of political interests and ensured principled judicial reasoning at the new court (Ohlin Reference Ohlin2007, 77). Thus, the active participation of professionals with civil law and criminal law backgrounds in the Rome Statute negotiations introduced new patterns of socially meaningful rules in the ICL field—namely, the importance of codifying and categorizing legal principles.

Notably, because of the importance of expert authority within the legal field, legal scholars and practitioners became particularly influential actors during the drafting of the general principles in the Rome Statute, including the modes of liability. Because the general principles were considered the “most technically difficult part of the Statute” (Bassiouni Reference Bassiouni2005, 158) and comparatively “non-political” (Saland Reference Saland and Lee1999, 193), the significance of expert knowledge increased. The drafting records reveal that the main actors who influenced the content of the Rome Statute’s general part were an “informal group” of unnamed criminal law experts at the Preparatory Commission on the ICC Statute (Preparatory Committee 1996, 6) and the official Working Group on the General Principles of Law at the Rome Conference, coordinated by the Swedish representative Per Saland (Reference Saland and Lee1999). Furthermore, many of the general principles codified in the Rome Statute were adopted from the proposals made in the Siracusa draft that had been drafted earlier by a group of authoritative scholars (Ambos Reference Ambos1996, 521).Footnote ²⁷ Thus, by virtue of their expert authority, legal professionals turned out to be particularly influential actors in ICL practice during the Rome Statute’s negotiations.

The codification of the general criminal law principles in the Rome Statute can thus be traced not only to state interests but also, more importantly, to the background understandings of many legal scholars at the time about the need for a more principled approach to the assessment of criminal responsibility at the future court. During that time, the so-called “liberal critique” of ICL, an academic movement defending compliance with the principles of criminal law, grew in power (Robinson Reference Robinson2020, 5). From a liberal perspective, the fundamental principles of criminal law are said to ensure that judgments on mass atrocities would no longer be based on the “gut-level decisions” of individual judges but, rather, on the dispassionate application of the law (Ohlin Reference Ohlin2007, 88). Representatives of this critical liberal school in ICL include ICL academics with extensive background in comparative and domestic criminal law, such as Elies van Sliedregt, Kai Ambos, Thomas Weigend, Jens D. Ohlin, and Darryl Robinson, to name a few.

Furthermore, the very concepts of “state interests” or “state beliefs,” used respectively in the rationalist and constructivist literature, become problematic when examined in practice. During the Rome Statute’s drafting, there was significant disagreement between the delegates of countries with different domestic penal systems regarding the appropriate scope of criminal responsibility. Common law countries favored the inclusion of a provision akin to conspiracy, which they considered would have enabled the court to efficiently fulfill its purpose of ending impunity for mass crimes. But that proposition triggered stark opposition among civil law countries, which expressed worry about the compliance of such theories with the culpability principle (Saland Reference Saland and Lee1999, 199). Consequently, what seemed to be “rational” or “appropriate” to states, or for that matter to legal experts, during the Rome Statute’s drafting, depended on their respective background knowledge.

While the background knowledge of human rights and IHL practitioners, as well as of criminal lawyers from common law systems, long dominated the ICL community of practice, the ICC’s establishment provided criminal lawyers from civil law systems with greater influence within the field, which resulted in modifications of the socially meaningful patterns of legal reasoning in ICL. In the words of one scholar, the general part of the Rome Statute and, more generally, the categorization of legal rules, “emancipated” ICL from the “rudimentary nature of international law” and turned it into a mature system of criminal justice (Militello Reference Militello2007, 943). From this perspective, the drafting of the Rome Statute constituted a unique opportunity to move past the considerations of “developing” ICL and “ending impunity” for mass crimes and to prioritize instead procedural fairness and the defendant’s rights (Amann Reference Amann2003, 180–81). As the next section discusses, most ICC judges shared the understandings of their colleagues who drafted the Rome Statute and adopted a similarly restrained interpretation of those general principles.

Interpreting the Rome Statute

The belief in the importance of upholding a strict interpretation of the principles of criminal law and the civil law know-how became especially pronounced when the ICC began operation in the early 2000s. The fact that the general principles of law had been codified in the statute did not guarantee that ICC judges would follow such rules in practice. No matter how precise the wording of the law, the latter is always in need of judicial interpretation (Helfer and Slaughter Reference Helfer and Slaughter2005, 937; Greenawalt Reference Greenawalt2011, 1080). ICC judges were left with a “[c]onsiderable discretion” in interpreting the statutory text (Schiff Reference Schiff2008, 45), and some commentators considered it “unrealistic” that the formal codification of criminal law principles would meaningfully restrain the ICC judges from engaging in creative interpretations of the law (Wessel Reference Wessel2006, 414). Therefore, some commentators thought that ICC judges would follow the practice of previous tribunals and interpret the gaps in the statutory text in a manner that would render convictions easier (Jessberger and Geneuss Reference Jessberger and Geneuss2012, 1083). Yet ICC judges have not only proactively declared fidelity to the principles of criminal law but also interpreted the relevant Rome Statute provisions in a more restrained manner than seems to have been intended by the drafters (Cryer Reference Cryer2009, 403–4).Footnote ²⁸

Some have perceived these restrained interpretations as deference to state interests (Cryer Reference Cryer2009, 392), but such accounts ignore the pleas of many legal experts to abandon the controversial practices, or patterns of legal reasoning, of the UN tribunals concerning the assessment of criminal responsibility (see Danner and Martinez Reference Danner and Martinez2005, 88; Ambos Reference Ambos2006, 104). The “practice” approach provides important insights into the interpretation of Article 25(3)(a) of the Rome Statute—a provision of key significance for trial outcomes—because it elucidates the transformation of the socially meaningful patterns of legal reasoning that has taken place with the establishment of the ICC. Since mass atrocities are committed by a multitude of persons, the interpretation of Article 25(3)(a) of the Rome Statute, which provides that a person could be held criminally responsible for committing “jointly with another” person an international crime, bears significant implications for the prospects of successful prosecutions at the ICC. The Rome Statute’s rather “vague” definition—“jointly with another”—required further interpretation at the court (Weigend Reference Weigend2008, 479). At first, the legal representatives of victims at the ICC interpreted that phrase as pertaining to the notion of “joint criminal enterprise.”Footnote ²⁹ Some commentators on the Rome Statute also expected the judges at the new court to be “strongly influenced” by the prolific jurisprudence of the UN tribunals on JCE (Schabas Reference Schabas2007, 215). But, instead, the ICC judges firmly rejected JCE and determined instead that to convict a person under Article 25(3)(a) required evidence that the defendant had exercised “control” over the commission of the crime, evidenced in the accused’s power to “frustrate” its commission.Footnote ³⁰ These strict requirements were differentiated from the jurisprudence of the UN tribunals, which merely required that the defendant had made an intentional contribution toward the collective crime, regardless of the level of that contribution.Footnote ³¹ In effect, the interpretation forwarded by the ICC judges significantly narrowed the scope of situations in which a person could be found guilty for committing an international crime.

Notably, the analysis of the official drafting history of Article 25(3)(a) of the Rome Statute nowhere suggests that states contemplated to include the requirement of proving the defendant’s “control over the crime.” The interpretation of Article 25(3)(a) betrayed the judges’ preferences for interpreting the text rather than a “narrow, literal interpretation” of the Rome Statute (Weigend Reference Weigend2011, 109; emphasis added). As Leila Sadat and Jarrod Jolly (Reference Sadat and Jolly2014, 775) point out, Article 25(3) is a “a consensus provision,” the product of the complex negotiations among experts with different legal backgrounds and, consequently, “lacks a strong and logically cohesive theoretical underpinning.” ICC judges themselves acknowledged that their interpretations were not “the only” one compatible with the statutory wording.Footnote ³² Rather, Article 25(3) has been described as a “Rorschach blot” because experts read into the provision their own professional experience and background ideas about criminal liability (774). While ICC judges could have used their constrained independence in interpreting the Rome Statute to expand the scope of situations in which a defendant could be found guilty—thus, following the practices of previous tribunals—they chose to do the opposite.

The judges’ decision should be understood in the context of the transformation of the socially meaningful patterns of legal reasoning taking place within the ICL community of practice, facilitated by the increasing influence of criminal law expertise and, especially, that of civil law countries like Germany (Minkova Reference Minkova2022). The substitution of JCE for the “control-over-the-crime” theory reflected the backlash against the victim-oriented humanitarian approach of previous tribunals. Authoritative criminal law experts with civil law background had expressed the opinion that JCE had no place at the permanent ICC (see Ambos Reference Ambos2007, 172–73). The ICC judges’ adoption of the “control-over-the-crime” theory did not gain unanimous support in the ICL field, but it was welcomed by those criminal law academics who had for long expressed concern with the UN tribunals’ controversial jurisprudence (Fletcher Reference Fletcher2011, 190). Already before the ICC adopted the “control-over-the-crime” theory in 2007, a few German scholars, well-known in the ICL field, including Kai Ambos (Reference Ambos2006, 664), Gerhard Werle (Reference Werle2005, 124n196), and Albin Eser (Reference Eser, Cassese, Gaeta and Jones2002, 796), had pointed out the merits of relying on that theory in relation to Article 25(3)(a). The adoption of the “control” theory instead of JCE may also have something to do with the presence of civil law-trained judges at the ICC’s pre-trial chambers in Lubanga and Katanga and Ngudjolo, including Judge Sylvia Steiner from Brazil, Judge Anita Ušacka from Latvia, and Judge Claude Jorda from France (Steer Reference Steer, van Sliedregt and Vasiliev2014, 45–46). The “control” theory (Tatherrschaft) was developed by the German legal scholar Claus Roxin ([Reference Roxin1963] 2011) in 1963. Even though the ICC judges argued that theory was applied by “numerous legal systems,”Footnote ³³ it has generally been recognized in Germany and some Latin American countries (Ambos Reference Ambos2007, 182; van Sliedregt Reference Van Sliedregt2012, 107).

In fact, one ICC judge with common law professional background—namely, Judge Adrian Fulford from the United Kingdom—objected to the adoption of the “control-over-the-crime” theory, which he saw as excessively demanding and placing “an unnecessary and unfair burden on the prosecution.”Footnote ³⁴ Whether that opinion was informed by his common law background, a humanitarian concern for delivering substantive justice for mass atrocities, or both, Judge Fulford preferred a more pragmatic and less strict interpretation of the Rome Statute. However, his position remained the minority one at the ICC, which was dominated by the standards of acceptable criminal law practice found in civil law countries. As the next section discusses, the restrained approach to criminal responsibility, informed by the dominance of criminal law expertise at the ICC, has significantly challenged the prosecutor in establishing a link between the accused and the crimes, which has contributed to the acquittals and dismissals of charges in several cases.

Insights into the ICC’s Trial Record

For nearly two decades of operation, the ICC has convicted only five persons for core international crimes. Four persons have been acquitted, ^{Footnote 35} the proceedings against two persons have been terminated, ^{Footnote 36} and all charges against four others have been dropped before trial. ^{Footnote 37} At first, it appears that the scarcity of successful ICC prosecutions may be the result of the challenges that the international court faces in the realm of interstate politics. Indeed, states can refuse to surrender a suspect to the court, as it happened in the case against the former Sudanese president Omar Al-Bashir. The systemic nature of mass atrocities and the time lapse between the crimes and the investigation further obstructs the collection of incriminating evidence. But this state-centered account of how international law operates presents only part of the picture. As this section demonstrates, the analyses of the practices of ICC judges, and specifically the agreed-upon strict standards of performance regarding the assessment of criminal responsibility at the court, provide new insights into the ICC’s trial record. The importance of background understandings about the appropriate application of the modes of liability at the court is particularly evident in the cases against accused without any apparent political backing by states.

The ICC judges’ interpretation of Article 25(3) concerning “joint” perpetration of a crime by a multitude of individuals in accordance with the demanding German “control-over-the-crime” theory proved a significant obstacle to establishing a link between the accused and the crimes. The “control” theory required that the crime was committed pursuant to a “common plan” among the perpetrators, which needed to contain an “element of criminality.”Footnote ³⁸ Influential members of the ICL community of practice with extensive professional background, such as Judge Christine van den Wyngaert, cautioned that the judges should delineate a clear criminal element of the alleged “common plan.” Otherwise, the argument goes, the link between the accused, who had participated in what could otherwise be a largely political or military plan, and the specific crimes that resulted from the implementation of that plan would be obfuscated.Footnote ³⁹ This would infringe upon the principle of personal culpability in a similar manner as the controversial JCE III (van Sliedregt, Ohlin, and Weigend Reference Van Sliedregt, David Ohlin and Weigend2013, 735–39). But the ICC judges have lived up to the standards of competent performance agreed upon by criminal law experts, even if that meant acquittals of the accused, as was the case in 2019 during the trial against the former Ivoirian president Laurent Gbagbo and his aide Charles Blé Goudé. The ICC judges were critical of the fact that “[u]pon the pretext” that the common plan of the perpetrators must not be exclusively criminal, the prosecutor had presented a lot of evidence regarding the non-criminal aspects of Gbagbo’s alleged plan to stay in power in Côte d’Ivoire after losing the 2010 elections, but failed to provide sufficient evidence regarding the criminal elements of that plan.Footnote ⁴⁰ Consequently, the judges acquitted both accused by majority.

Another difficulty for the ICC prosecutor has been the judges’ preference for inferring “control” over the crimes from the accused’s direct involvement in the crimes rather than from their official position within the criminal group. Particularly illustrative in this regard are the 2010–11 proceedings in Abu Garda and Banda and Jerbo, concerning the 2007 attack on the Hashkanita compound in Darfur, Sudan.Footnote ⁴¹ The prosecution argued that, as the alleged commanders of the attacking troops, Bahar Idriss Abu Garda, Abdallah Banda Abkaer Nourain (Banda), and Saleh Mohammed Jerbo Jamus (Jerbo) had jointly perpetrated the attack on Hashkanita.Footnote ⁴² Regarding Abu Garda’s control over the crimes, the prosecutor drew on evidence of the suspect’s alleged participation in the meetings when the attack was planned. But the judges, concerned by the lack of “reliable” evidence of Abu Garda’s personal participation in the attack, dismissed all charges against him.Footnote ⁴³ Similarly, in Ngudjolo, the judges acquitted the accused due to a lack of evidence that he had controlled the militant group, which had attacked civilians.Footnote ⁴⁴ By contrast, several witnesses confirmed that Banda and Jerbo had personally led their forces in the Hashkanita attack and had taken part in the looting of the compound afterwards.Footnote ⁴⁵ Since Banda and Jerbo’s personal involvement in the crimes was established, the judges confirmed the charges of co-perpetration against these suspects.Footnote ⁴⁶

In 2019, similar dynamics occurred in Yekatom and Ngaïssona. Yekatom was a commander of an “Anti-Balaka” armed group, allegedly involved in attacks against the Muslim population in the Central African Republic. Patrice-Edouard Ngaïssona was a senior figure with political and diplomatic functions who operated at the national level of the Anti-Balaka structure.Footnote ⁴⁷ The judges confirmed the charges of joint perpetration of crimes under Article 25(3)(a) against Alfred Yekatom but were not convinced that Ngaïssona had enjoyed “control” over the anti-Balaka troops, given their “high degree of autonomy” in military operations.Footnote ⁴⁸ Thus, ICC judges have displayed preferences for establishing the accused’s personal involvement in the crimes.

The background understandings that ICL requires strict interpretation of criminal law principles by view of protecting the defendant’s presumption of innocence helps explain how most ICC judges have interpreted and applied the Rome Statute’s provisions concerning criminal responsibility. But the practice perspective also elucidates where the dissenting opinions to some of those judgments came from. The humanitarian view of legal practice was still upheld by some within the ICL field. For example, Judge Olga Venecia Herrera-Carbuccia dissented from the decision of her colleagues to acquit Laurent Gbagbo and Charles Blé Goudé, arguing that the ICC should not “allow” a president “to target citizens” and go unpunished.Footnote ⁴⁹ From Herrera-Carbuccia’s perspective, the ICC’s mandate was not limited to the assessment of individual criminal responsibility but included broader goals such as deterrence and social restoration. NGOs have also expressed regret that the victims of mass atrocities would not see justice being served when a case has ended up in acquittal (Amnesty International 2019). But while the victim-oriented humanitarian vision of ICL was particularly prominent at Nuremberg and the UN tribunals, the establishment of the ICC has seen a significant shift toward defendant-oriented criminal justice, which no longer recognizes the previous practices for delivering easier convictions as acceptable (Minkova Reference Minkova2022).

Thus, the practice-based analysis of ICC’s decision making provides new insights into trial outcomes that have generally remained overlooked from a state-centered international relations perspective. International relations studies of the ICC generally note that, due to its dependency on state cooperation for executing arrests and collecting evidence, the ICC needs to “accommodate” states’ interests and abstain from prosecuting figures with powerful political backing (Bosco Reference Bosco2014, 20). Thus, the scarcity of successful international prosecutions is attributed to the embeddedness of international law within state power politics. This provides an important, but limited, insight into the ICC’s operation. Notably, in all the aforementioned cases, which have ended in acquittal or dismissal of (some) charges, the accused constituted either deposed officials or rebel commanders without significant government backing. Banda and Jerbo were members of insurgent groups who fought against the Sudanese government forces in Darfur. Yekatom and Ngaïssona were commanders of anti-Balaka groups in the Central African Republic, reportedly loyal to the deposed president François Bozizé.Footnote ⁵⁰ Regarding Gbagbo, while it falls beyond the scope of this article to disentangle the variety of state interests surrounding the trial, it is worth noting that the Ivoirian government opposed Gbagbo’s release, arguing that his return home would destabilize the country (Wakabi Reference Wakabi2020). The state-centered international relations scholarship helps explain why these persons may have ended up at the ICC—namely, because no government has opposed their transfer to the court but falls short of enquiring into what happens with their trials afterwards. By contrast, because the practice perspective elucidates how the ICL field operates from within, it also provides novel insights into the assessment of criminal responsibility, regardless of the political background of the accused.

Finally, it is important to clarify what this analysis is not suggesting. First, the scope of this article is limited to the construction of a specific set of ICL rules, premised on criminal law principles—the modes of liability. Because ICL is a compilation of different legal systems, it might be the case that the ICC judges have employed different interpretative approaches concerning other legal rules that do not concern the assessment of criminal responsibility, such as the court’s jurisdictional reach or the scope of the Rome Statute’s core crimes. Second, to suggest that the strict criminal law standards of the assessment of criminal responsibility have dominated ICC jurisprudence is not to say that the judges aim to deliver acquittals or that no cases can be successful at the court. It is simply an observation that the vision of ICL that came to dominate the ICC has prioritized the narrow technical application of legal rules, regardless of the trial outcome. So far, this priority has resulted in several high-profile acquittals and dismissals of charges at the court, but this need not be the case in the future if the prosecutor adapts to the heightened expectations of the judges regarding the quality and logical consistency of the evidence. Indeed, in cases concerning mid-level insurgent commanders who have been directly involved in hostilities and personally engaged in criminal conducts, such as Dominic Ongwen ^{Footnote 51} and Bosco Ntaganda, ^{Footnote 52} the prosecutor has obtained convictions.

Finally, the background knowledge of the participants in the ICL field need not be the only determinant of trial outcomes. Other factors, such as the limited opportunities for collecting evidence of mass atrocities could significantly challenge the prosecutor. Scholars have observed the pervading problems with the early ICC investigations, such as the use of intermediaries to collect evidence, the lack of local knowledge, and the short field trips of the prosecutor to the investigation sites (De Vos Reference De Vos2013). Notably, different factors such as the problems of collecting evidence, the interests of governments, and the politics of the legal field can influence trial outcomes in conjunction. The availability of government assistance is crucial for the prosecutor’s ability to collect evidence. Furthermore, depending on the standards of competence recognized among the judges, they may be willing to tolerate to a varying degree the prosecutor’s investigation hurdles. Nancy Combs (Reference Combs2010) observes that the UN tribunals have often lowered the burden of proof on the prosecutor by admitting evidence that would otherwise not meet the standards of domestic proceedings. By contrast, in cases like Bemba or Gbagbo and Blé Goudé, the ICC judges have demonstrated “zeal for impeccable standards” and a “hypersceptical” attitude toward incriminating evidence, which has precluded the prosecutor from convincing them of the defendant’s guilt (Robinson Reference Robinson2019). Thus, while international prosecutors generally face the challenges of obtaining state cooperation and collecting evidence for mass atrocities, the strict interpretation of the applicable law by the judges may amplify these hurdles.