In Private Military and Security Contractors: Controlling the Corporate Warrior a multinational team of 16 scholars and a practitioner from political science, sociology, and law address a developing phenomenon: controlling the use of privatized force by states in international politics. Robust analyses of the evolving, multi-layered tapestry of formal and informal mechanisms of control include addressing the microfoundations of the market: the social and role identities of contract employees, their acceptance by military personnel, and potential tensions between them. The extent and willingness of key states—South Africa, the United States, Canada, the United Kingdom, and Israel—to monitor and enforce discipline to structure their contractual relations with PMSCs on land and at sea is examined, as is the ability of the industry to regulate itself. Finally, they assess the nascent international legal regime to reinforce state and industry efforts to encourage effective practices, punish inappropriate behavior, and shape the market to minimize the hazards of loosening states’ oligopolistic control over the means of legitimate organized violence. Together, the volume presents a theoretically-informed synthesis of micro- and macro-levels of analysis, producing new insights into the challenges of controlling the agents of organized violence used by states for scholars and practitioners alike.