Analysis shows lone actors more likely to commit terrorist acts than US extremist groups

Extremist groups like the Ku Klux Klan and the Proud Boys have long been an ugly undercurrent of American culture. But despite these groups' hateful rhetoric, their ranks have largely refrained from committing violent acts over the past three decades, according to research conducted by Andrew Vitek, associate teaching professor of political science and director of the Department of Political Science's counterterrorism option at Penn State.