The KKK was founded by the Dem party in response to Repubs freeing Black people from slavery. They wanted to make sure blacks were either gonna vote dem or not vote so they used terrorism. The first Black senators and house reps were all Republican so the KKK was the Dem response.
The last relic from those days died just a few years ago, Senator Robert Byrd, Dem, Virginia. Former KKK Grand Kleagle.