Robert Gerwarth is the author and editor of several books on the history of violence, including a biography of Reinhard Heydrich (with Donald Bloxham, 2011), Political Violence in Twentieth-Century Europe (2011); and War in Peace: Paramilitary Violence after the Great War (with John Horne, 2012).Erez Manela directs the Program on Global Society and Security at Harvard University. He is the author of The Wilsonian Moment: Self-Determination and the International Origins of Anticolonial Nationalism (2007) and co-editor of The Shock of the Global: The 1970s in Perspective (2010). He is currently completing a book on the global eradication of smallpox in the Cold War era. Less