This cohesive set of case studies collects scholarly research, policy evaluation, and field experience to explain how terrorist groups have developed into criminal enterprises. Terrorist groups have evolved from orthodox global insurgents funded by rogue sponsors into nimble and profitable transnational criminal enterprises whose motivations are not always evident. This volume seeks to explain how and why terrorist groups are often now criminal enterprises through 12 case studies of terrorist criminal enterprises written by authors who have derived their expertise on terrorism and/or organized crime from diverse sources. Terrorist groups have been chosen from different regions to provide the global coverage. Chapters describe and analyze the actors, actions, problems, and collaborations of specific terrorist criminal enterprises. Other elements discussed include links to such facilitating conditions as political culture, corruption, history, economy, and issues of governance. This work advances scholarship in the field of counterterrorism by expanding the understanding of these terrorist groups as entities not driven purely by ideology but rather by the criminal enterprises with which they often coincide.