Profiles of Individual Radicalization in the United States (PIRUS) is a database of 2,149 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 2017. The database is freely available for download on START’s webpage at http://www.start.umd.edu/profiles-individual-radicalizationunited-states-pirus-keshif. 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, Patrick James, Aaron Safer-Lichtenstein, Elizabeth Yates, and Gary LaFree. 2018. "Profiles of Individual Radicalization in the United States (PIRUS)." College Park, MD: START (October). https://www.start.umd.edu/pubs/START_PIRUS_ResearchBrief_Oct2018.pdf