Regarding the KKK from a non-expert historical perspective I’ve always considered them just a pack of lower class, Bible Belt white panic racists who tried to be as oppressive and terrifying as possible to black people and more recently included Jews and Catholics on their enemies list as well. So this statement by a Georgia politician linked below was a bit surprising. So much so I pulled up the Ku Klux Klan wiki.
In reading the KKK wiki the Klan was a MUCH bigger deal membership and influence wise than I had imagined and it was (surprisingly) tightly woven into prohibition, and anti-Catholic and anti immigrant movements. It was more popular, more complex, and a lot more middle class than I imagined and has (IMO) some interesting overtones as to what is going in in the current realignment of the GOP power base to people holding unapologetic anti-immigrant and not so crypto-racist views. Are these racist views going to drive the GOP going forward? The GOP power brokers are now, it seems, holding their noses and sidling up to Trump.