The document provides an overview of white racial extremist groups in the United States, including the Ku Klux Klan, American Nazi Party, Aryan Nations, and other neo-Nazi and racist skinhead groups. It discusses the beliefs, origins, and activities of these groups, and examines topics like hate crimes, the role of music and the internet, and challenges in measuring their membership. Interviews have been conducted with over 325 individuals involved in extremist organizations.