Over the past decades, international criminal law has evolved to become the operative norm for addressing the worst atrocities. Tribunals have conducted hundreds of trials addressing mass violence in the former Yugoslavia, Rwanda, Sierra Leone, Cambodia, and other countries to bring to justice perpetrators of genocide, war crimes, and crimes against humanity. But international courts have struggled to hold perpetrators accountable for these offenses while still protecting the fair trial rights of defendants. Punishing Atrocities through a Fair Trial explores this tension, from criticism of the Nuremberg Trials as ‘victor’s justice’ to the accusations of political motivations clouding prosecutions today by the International Criminal Court. It explains why international criminal law must adhere to transparent principles of legality and due process to ensure its future as a legitimate and viable legal regime.