Flutterings

Agree with everything schemingreader has said. I can send you the biblio for my dissertation, if you like - it's not Klan-focused, but I did a ton of research to disprove my original theories that the Klan was involved in the decline of Southern Catholic colleges....

The Wikipedia KKK page is actually quite good for its brevity. The Trelease book cited in the references is hugely based on primary docs, though a lot of the other sources are first-hands or aimed at a popular audience. David Chalmers's Hooded Americanism is where I'd probably go first, then the Trelease book.