This book examines the nature of transnational organized crime and gangs, and how these diverse organizations contribute to violence, especially in so-called fragile states across Central and Latin America. While the nature of organized crime and violence differs depending on the context, the authors explain how and why states plagued by weak institutions tend to foster criminal organizations and violence, and why counter-crime initiatives often result in higher levels of violence. By examining the consequences of tough on crime policies (e.g., mano dura) in places like Mexico, El Salvador, and Colombia, the volume offers a new perspective on the link between state fragility, crime, and violence.