The Role of Social Networks in the Evolution of Al Qaeda-Inspired Violent Extremism in the United States, 1990-2015

By Jytte Klausen

This report analyses the networks and organizations that mobilize and direct Americans for jihadist action, or that raise money in the US for Hamas and Hezbollah. The study employs a quasi-experimental method using a control-case design, comparing the network structures of American terrorism offenders inspired by Hezbollah with those of Sunni extremist groups aligned with Al Qaeda, and in recent years ISIL.

Washington, DC: U.S. Department of Justice, 2016. 71p.