In this sweeping, definitive work, leading human rights scholar David M. Crowe offers an unflinching look at the long and troubled history of genocide and war crimes. From atrocities in the ancient world to more recent horrors in Nazi Germany, Cambodia, and Rwanda, Crowe reveals not only the disturbing consistency they have shown over time, but also the often heroic efforts that nations and individuals have made to break seemingly intractable patterns of violence and retribution - in particular, the struggle to create a universally accepted body of international humanitarian law.