| Noun | 1. | Ku Klux Klan - a secret society of white Southerners in the United States; was formed in the 19th century to resist the emancipation of slaves; used terrorist tactics to suppress Black peopleact of terrorism, terrorism, terrorist act - the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or coercion or instilling fear klavern - a local unit of the Ku Klux Klan South - the region of the United States lying to the south of the Mason-Dixon line grand dragon - a high ranking person in the Ku Klux Klan |