The Ku Klux Klan (KKK) is a white supremacist hate group that emerged in the United States after the Civil War, specifically during the Reconstruction era. This organization aimed to maintain white dominance through acts of terror and intimidation against African Americans and their allies. The Klan's activities contributed to the establishment of a racially segregated society in the 'New South', highlighting the resistance to civil rights and social equality for freed slaves.