As the death toll mounts―as many as 25 million in the former Soviet Union, 65 million in China, 1.7 million in Cambodia, and on and on―the authors systematically show how and why, wherever the millenarian ideology of Communism was established, it quickly led to crime, terror, and repression. An extraordinary accounting, this book amply documents the unparalleled position and significance of Communism in the hierarchy of violence that is the history of the twentieth century.