The Ku Klux Klan's original modus operandi was very strong and very violent anti-Catholicism, which is why it's mystifying to see Catholics that supported David Duke's Senate run last year. The KKK wanted y'all dead, I hope you realize that.
Where in the world have you ever heard that? Do you have any shred of evidence of such a statement?
Just when did Dr. Duke ever make such an insinuation?
The Klan was formed specifically against the Northern Occupation, persecution politics and carpetbagging that went on after the CW. It really didn't even have much to do with the newly freed black slaves in the beginning.
I think you need to go back to your college history classes. Or, perhaps that is the problem.