INTRODUCTION

Crimes against humanity is the common element in the law and practice of the International Criminal Tribunal for the former Yugoslavia (ICTY) and the International Criminal Tribunal for Rwanda (ICTR). It is the glue that ties these institutions together in terms of their subject matter jurisdiction. Looking at the judgments of the ICTY, one notices the difficulty in securing convictions for genocide, but crimes against humanity figure prominently in both indictments and convictions, with the exception of a few cases only dealing with war crimes. At the ICTR, genocide is the focus in practically all cases, but each genocide accusation is backed up by crimes against humanity accusations, especially extermination, murder, and persecution; thus the ICTR confirms the (historically) close relationship between both sets of crimes. But the ICTR rarely convicts for war crimes, for the reasons that the prosecution does not tend to include it in the indictment and that in (early) case law, ICTR Trial Chambers found no nexus between genocidal acts and the armed conflict. As far as the Special Court for Sierra Leone (SCSL) is concerned, it has no jurisdiction over genocide, but only over war crimes, crimes against humanity, and a limited set of crimes under Sierra Leonean law. All judgments of that court deal with allegations of both war crimes and crimes against humanity.

Thus, the UN ad hoc tribunals truly are crimes against humanity courts and undeniably have in their practice contributed significantly to the definition and understanding of the crime.