The Ku Klux Klan was founded as the activist wing of the Democratic Party.
VIA| On September 28, 1868, a mob of Democrats massacred nearly 300 African-American Republicans in Opelousas, Louisiana. The savagery began when racist Democrats attacked a newspaper editor, a white Republican and schoolteacher for ex-slaves. Several African-Americans rushed to the assistance of their friend, and in response, Democrats went on a “Negro hunt,” killing every African-American (all of whom were Republicans) in the area they could find. (Via Grand Old Partisan)