The Ku Klux Klan, or KKK, is the white supremacist group in the US that spread racism and hate among white and black people. After the Nazis occupied the US, they helped the KKK purge the African-American community through brutality and oppression. As a result, most black people joined the American Resistance to fight both the Nazis and the KKK.
However, in Roswell, New Mexico shows the Klan treads cautiously around Nazi Authorities for they are no exception to the strict German Learning policy that is being enforced in the Nazi-Conqured US.
They will be the minor enemy in the Wolfenstein: The New Colossus. They are extremely weak since none of them wear armor and a single shot from any guns can put them down easily.