This chapter tests cycles of silence in Lagos to evaluate its applicability in a Global South context where, unlike Baltimore, the state and the police have limited resources. The chapter’s results come from an original survey of shopkeepers, paired with interviews and observation, in the city’s expansive markets, pockets in which “area boy” crews engage in violence and extortion. Consistent with the patterns found in Baltimore, area boy violence reduces cooperation by boosting perceived retaliation risk and making cooperation norms appear to be weaker than they are. Underlying cooperation support exists among shopkeepers, the chapter’s final section explains, in part, because the area boy crews have largely failed to gain legitimacy with Lagosians.

The Conclusion first summarizes the study’s findings. It then presents the study’s policy implications that might help inform local actors’ decisions on interventions related to police–citizen cooperation in communities with criminal groups. Additional research questions are also proposed. In particular, how the study’s findings might relate to contexts experiencing political violence such as civil war or insurgency remains an avenue for future research. The final section highlights that populations are projected to grow fastest in countries with strong criminal groups and weak state institutions for fighting those groups. This trend increases the urgency to understand vacuums of justice and how they might be filled.

This chapter tests cycles of silence theory in Baltimore to evaluate its applicability in a Global North context where the state and the police are well resourced. It provides background on how Baltimore residents become exposed to violence by drug crews and details the results from an original survey of residents in the city’s violence- affected communities. Violence heightens perceived retaliation risk, and the heightened risk perception in turn pushes residents who support cooperation to keep that support private. As result, residents share less information than they otherwise would in absence of this norm suppression. The chapter’s final section explains that the underlying cooperation support exists, because the drug crews have largely failed to gain legitimacy in eyes of residents.

This chapter lays out the study’s research design. The design aims to enhance cycles of silence theory’s generalizability at two levels. At a macro level, the goal is to increase the potential that, contingent on local factors, the theory applies to as many of the communities facing criminal group violence as possible. It does so by drawing on logic derived from human social psychological dynamics, leveraging a wide range of existing datasets including a global survey of 109,000 citizens, and studying communities both the Global North (Baltimore, Maryland) and Global South (Lagos, Nigeria). At a micro level, the design combines cross-national data with original surveys as well as interviews and first- hand observations in Baltimore and Lagos. This multimethod approach improves the likelihood that the findings from the surveys and interviews in Baltimore and Lagos accurately reflect cooperation dynamics in the cities. Finally, the chapter provides definitions for key terms related to the study’s main actors – criminal groups, police, and citizens – and the main outcome of citizen cooperation with the police.

This chapter presents the results of a survey experiment testing cooperation interventions in Lagos. It provides background information on the relatively limited efforts to date to promote police–citizen cooperation in the megacity. The chapter describes the virtual reality–based survey experiment used to test the interventions in which respondents are shown a hypothetical area boy fight from a shopkeeper’s point of view. The results indicate that respondents who viewed the vignettes with an anonymous tip line and the intervention to raise awareness of cooperation support among shopkeepers boosts information sharing. Exposure to co-ethnic police officers in the vignette, however, shows little effect on information sharing. The chapter also discusses the mechanisms through which cooperation support exists despite widespread distrust of the Nigeria Police Force among Lagosians.

This chapter presents the results of a survey experiment testing cooperation interventions in Baltimore. It describes existing efforts in the city to promote cooperation with the police and how police rely on information from witnesses. The survey experiment entails respondents viewing and responding to a professionally produced fictional news report of a shooting with experimental variations to test the various interventions. The results show police encouraging cooperators to call an anonymous tip line (as opposed to a non-anonymous line) as well as creating awareness of cooperation norms both increase information sharing. The police commander portrayed in the news report being the same race as the respondent does not change the amount information that they are willing to share. The chapter also discusses the mechanisms of how support for cooperation exists in Baltimore despite distrust of the police.

This chapter theorizes how interventions employed by police and community safety advocates might promote cooperation. The evaluation focuses on two interventions that plausibly reverse cycles of silence: facilitating cooperator anonymity to reduce the risk involved in information sharing and creating awareness of support for cooperation to strengthen the perceived norms favoring information sharing. Given that these interventions do not address distrust in the police, which places a ceiling on cooperation support, the evaluation also includes the trust-based intervention of exposing citizens to police officers of the same race or ethnicity. The chapter concludes with enumerating principles that should be considered when evaluating the appropriateness of implementing interventions to promote cooperation.

This chapter explains the motivation for the study. A stark reality is that states often fail to provide justice in many communities enduring criminal group violence. Deaths from criminal group violence roughly equal deaths from war between states, intrastate conflict (namely, civil war and insurgency), and terrorism combined. Moreover, criminal group affiliates who engage in the violence do so with near impunity in many communities. Criminal groups’ ability to escape accountability means that these communities face what I term vacuums of justice. The chapter goes on to argue that justice provision is a core responsibility of the state and, by failing in this regard, states shirk one of their raisons d’être (reasons for existence) under the social contract. The chapter’s final section explains the link between justice provision and cooperation with the police, positing that the police’s reliance on information from witnesses often makes cooperation a necessary albeit insufficient linchpin for justice provision.