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Jeff Gruenewald

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Oklahoma City police officers salute 19 April during a moment of silence at a memorial service held on the first anniversary of the bombing of the Alfred P. Murrah Federal Building as they face the fence surrounding the bomb site. In the background are buildings destroyed in the blast that killed 168 adults and children. (CHRIS WILKINS/AFP via Getty Images)

Far-right extremist violence and American presidents: The pattern isn’t what you’d think

William Parkin, Jeff Gruenewald, Colleen Mills
(AP Photo/Bill Waugh, File)

Extremism from both sides: What does the research tell us about Islamist extremism and far-right extremism?

William Parkin, Brent Klein, Jeff Gruenewald, Joshua D. Freilich, Steven Chermak