Since 2008, the American patriot/militia movement—right-wing antigovernment groups who portray themselves as fighting encroaching tyranny—has grown exponentially. Oath Keepers is among the most visible and vocal of these organizations. Formed in 2009, Oath Keepers gained notoriety for its involvement in the Bundy Ranch standoff of 2014 and the Malheur Refuge occupation of 2016. The group gives voice to a recurrent form of American politics: virulent distrust of the government combined with a...