The links below will help to identify extremist groups. Look for groups that were founded as religious groups and that have committed acts of violence.
Extremist Groups in the United States by Southern Poverty Law Center
Hate Groups and Extremist Organizations in America: An Encyclopedia
Terrorist Groups: on the Office of the Director of National Intelligence's Counter Terrorism Guide
Terrorist Organizations - from the CIA World Factbook
Global Terrorism Database - information about worldwide terrorist events from 1970-2020.
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