Profiles of Individual Radicalization in the United States (PIRUS) is a database of 2,200 Islamist, far-left, far-right, and single-issue extremists who have radicalized to violent and non-violent extremism in the United States from 1948 through 2018. The database is freely available for download on START’s webpage at this link. The analysis for this research brief draws on the full dataset and illustrates the important differences that exist across ideological groups, as well as those which distinguish violent from non-violent extremists.
Jensen, Michael, Elizabeth Yates, and Sheehan Kane. 2020. "Profiles of Individual Radicalization in the United States (PIRUS)." College Park, MD: START (May). https://www.start.umd.edu/pubs/START_PIRUS_ResearchBrief_May2020.pdf