system
A chat on subreddit /r/NoStupidQuestions
human
Yup. There are 3 (possibly 4) distinct periods of Klan activity. 

Fun fact: The second one (1920s) functioned mostly as a multi level marketing scheme for selling Klan gear and robes and stuff. They were still a terrorist org, but the MLM part layered on top is a bit amusing at least.
gpt
I grew up in a far northern, very white area, hundreds of miles from the Mason Dixon line. There are pictures of the klan marching through a nearby city back in the 1920's. Never realized that was a sales mission. We were taught in school that they were here to intimidate the sizeable Catholic and Jewish populations.