Actually, no, they weren't. The Southern Bloc of Democrats were the most powerful bloc in Washington who voted against civil rights legislation up until and including the Civil Rights Act of 1964.<quoted text>
...and the democrats in the South that you of speak were conservatives.
You can do the "liberal shuffle" all you want and try to deny PBS isn't a credible source and even liberal-leaning, but this is what they reported about the KKK in the South:
"Racist activity in the South often took the form of riots that targeted blacks and Republicans."
If you keep reading the article, they also wrote this:
"Across the South, the Klan and other terrorist groups used brutal violence to intimidate Republican voters."
You apparently aren't old enough to know this part of history.
Or you're so far in denial, you'll believe just about anything you're told to believe.
I hope it's the former.