An extremist, paramilitary, right-wing secret society founded in the mid-nineteenth century and revived during the 1920s. It was antiforeign, antiblack, anti-Jewish, antipacifist, anti-Communist, anti-internationalist, anti-evolutionist, and antibootlegger, but pro–Anglo-Saxon and pro-Protestant. Its members, cloaked in sheets to conceal their identities, terrorized freedmen and sympathetic whites throughout the South after the Civil War. By the 1890s, Klan-style violence and Democratic legislation succeeded in virtually disenfranchising all southern blacks.