The law governing the relationship between speech and core international crimes a key component in atrocity prevention is broken. Incitement to genocide has not been adequately defined. The law on hate speech as persecution is split between the International Criminal Tribunal for Rwanda (ICTR) and the International Criminal Tribunal for the former Yugoslavia (ICTY). Instigation is confused with incitement and ordering's scope is too circumscribed. At the same time, each of these modalities does not function properly in relation to the others, yielding a misshapen body of law riddled with...