What motivates those who commit violence in the name of political beliefs? Terrorism today is not solely the preserve of Islam, nor is it a new phenomenon. It emerges from social processes and conditions common to societies throughout modern history, and the story of its origins spans centuries, encompassing numerous radical and revolutionary movements. Marc Sageman is a forensic psychiatrist and government counterterrorism consultant whose bestselling books Understanding Terror Networks and Leaderless Jihad provide a detailed, damning corrective to commonplace yet simplistic notions of Islamist terrorism. In a comprehensive new book, Turning to Political Violence, Sageman examines the history and theory of political violence in the West. He excavates primary sources surrounding key instances of modern political violence, looking for patterns across a range of case studies spanning the French Revolution, through late nineteenth- and early twentieth-century revolutionaries and