White supremacist paramilitary organizations, allied with Southern Democrats, used intimidation, violence, and assassinations to repress blacks and prevent them from exercising their civil rights in elections from 1868 until the mid-1870s. The insurgent Ku Klux Klan (KKK) was formed in 1865 in Tennessee (as a backlash to defeat in the war) and quickly became a powerful secret vigilante group, with chapters across the South. The Klan initiated a campaign of intimidation directed against blacks and sympathetic whites. Their violence included vandalism and destruction of property, physical attacks and assassinations, and lynchings. Teachers who came from the North to teach freedmen were sometimes attacked or intimidated as well.
