Answer: Ku Klux Klan is a racist organization that appeared in the 1865.
They appeared because of the abolition of slavery in the country, they started to organize meetings to chase and intimidate black people. They raped and killed black people, as well as white people that helped them.
They were known as cruel, and included Jews and Catholics in their list too. Nowadays they did not have the same strength, but is scary they are still exist.