The Klan had been around for decades by the time of Hitler and saw a big resurgence in the 1920's, around the same time Hitler was formulating his own racial ideologies.
Does anyone know if Hitler had ever commented on them or sought inspirations in any way?
More could be written, but you might like to read the first half of "Ku Klux Klan's reaction to Hilter" by /u/Georgy_K_Zhukov -- that half is about the reverse, Nazi reactions to the KKK.
This is not to discourage discussion. More questions, data, and debate are welcome.