A consortium of researchers dedicated to improving the understanding of the human causes and consequences of terrorism

Profiles of Radicalization in the United States


Profiles of Individual Radicalization in the United States (PIRUS) is a database of 1,867 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 2016. The database is freely available for download on START’s webpage or can be accessed through the project’s data visualization tool at http://www.start.umd.edu/profiles-individual-radicalization-united-states-pirus-keshif. The analysis for this fact sheet 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.

Publication Information

Full Citation:

Jensen, Michael, Patrick James, Gary LaFree, Aaron Safer-Lichtenstein, and Erin Copland. 2017. "Profiles of Individual Radicalization in the United States: Research Brief." START College Park, Maryland. September.