The abbreviation "KKK" stands for the Ku Klux Klan. It is an American white supremacist hate group, founded in 1865 during the Reconstruction era. The group is known for its extremist Protestant-led white nationalism, anti- immigration, antisemitism, anti-Catholicism, and violence including terrorism and intimidation mainly targeting African Americans, Jews, Catholics, and other groups. Historically, the KKK has operated as a secret society with members wearing distinctive robes and hoods to conceal their identities and has been responsible for numerous acts of hate crimes and terrorism in the U.S. across different time periods.