Book excerpt: The Causes and Consequences of Group Violence: From Bullies to Terrorists offers a transnational and transdisciplinary investigation of the causes and consequences of violence, ranging from bullying and hate crimes to revolutions, genocide, and acts of terrorism. Editors James Hawdon, John Ryan, and Mark Lucht bring together empirical investigations of these specific types of violence as well as theoretical discussions of the underlying similarities and differences among them. Focusing on both the perpetrators and targets of violence, The Causes and Consequences of Group Violencethis book is a valuable resource for sociologists, criminologists, political scientists, behavioral scientists, peace studies scholars, and psychologists.