Luis Moreno Ocampo, former Chief Prosecutor of the International Criminal Court, delivers a talk at Facing History and Ourselves’ Day of Learning: Confronting Evil in Individuals and Societies. Moreno Ocampo describes the importance of international law in preventing atrocities by illustrating examples, including the trials at Nuremburg and the Junta Trial in Argentina. He explains that the role of law in society is to clarify limits of behavior and provide incentives to behave well.