白人優越主義
Mob violence arose as a means of enforcing White supremacy and it frequently verged on systematic political terrorism. "The Ku Klux Klan, paramilitary groups, and other Whites united by frustration and anger ruthlessly defended the interests of White supremacy. The magnitude of the extralegal violence which occurred during election campaigns reached epidemic proportions, leading the historian William Gillette to label it guerrilla warfare."