The number of extremists and extremist groups in the United States has increased dramatically in the last 20 years. This encyclopedia, the only one of its kind, provides the most up-to-date information on 275 of the most influential and significant homegrown extremists and extremist groups that have operated in the U.S. since 1950, as well as entries on important extremist events, terms, and concepts. More than 75% of the coverage deals with the...