This book details the solicitation and indoctrination of members into extremist hate groups. Using theoretical, empirical, and field studies, experts explain the psychological processes of bias formation, hate identity, and stages into and out of extremism, and detail first-person accounts of hate group membership and hate violence. The book discusses the current wave of political and racial intolerance in the U.S. and Europe, addressing specific groups and forms of hate extremism found across cultural and geographic regions. Includes statistical analysis of how hate and ideology contribute to political extremism, with discussion of how individuals enter and leave hate-based lifestyles; a neuroscience explanation of hate ideology as a psychological problem; and discussion of the interplay of governments and stakeholders in untangling legal issues. For social and behavioral sciences students, researchers, and law enforcement, criminal justice, and political science professionals.