With inclusion of theories and causal factors for context, plenty of case studies for real-world application, and pedagogical features to encourage engagement, this book's coverage also goes far beyond the traditional focus on terrorist groups to provide readers with a stimulating and wide-ranging introduction to the subject. Examining non-state actors including warlords, gangs and private security companies, this title guides you through the core theories and concepts, taking a multidisciplinary approach; examines different explanations for the emergence of violent non-state actors as well as strategies for dealing with them; and weaves in international case studies from groups including the Islamic State, Los Zetas, Hamas, and Al Qaeda, as well as discussion questions, further reading and definitions of key terms. A must read for upper-level undergraduate and postgraduate students in politics, international relations, security, and terrorism studies.