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

Profiles of Individual Radicalization in the United States (PIRUS)


The Profiles of Individual Radicalization in the United States (PIRUS) dataset contains deidentified individual-level information on the backgrounds, attributes, and radicalization processes of over 3,500 violent and non-violent extremists who adhere to far-right, far-left, Islamist, or single-issue ideologies in the United States covering 1948-2022. Coded using entirely public sources of information, the PIRUS dataset is among the first efforts to understand domestic radicalization from an empirical and scientifically rigorous perspective. Users can now explore the rich PIRUS data using the Keshif data visualization tool, a user-friendly platform that allows for intuitive and insightful analysis of the data in real-time.

Click the image below to explore PIRUS using the Keshif data visualization tool. We recommend using the latest versions of Firefox or Chrome browsers to access the Keshif tool.

PIRUS Keshif Tool


You can also explore this five minute general tutorial on how to use the Keshif tool:


Other Investigators

Gary LaFree

Former PIRUS Team Members: 

Gary Ackerman, Ph.D.

Erin Copland, M.A.

Peter Henne, Ph.D.

Patrick James, M.A.

John Kennedy, M.A.

Aaron Safer-Lichtensetin, M.A.

John Sawyer, Ph.D.

Herbert Tinsley, M.A.

Mehmet Adil Yalcin

Anita Atwell Seate, Ph.D., Researcher

Daniela Pisoiu, Ph.D., Researcher

Elizabeth Yates

1948 to 2021