Ku Klux Klan hated blacks - would burn crosses in their yards as a warning for the to leave the area. would kidnap. tie them up in trees, killing and burning them. they wore white robes with a white cone shaped head cover that had holes in for their eyes. although i think there are still people who call themselves members of the clan, i think the level of hatred has gone way down. Unfortunately, they are still racist :(
The abbreviations KKK stands for Ku Klux Klan, which is the name of three distinct past and also present far-right associations in the United States. You can find out more details here http://en.wikipedia.org/wiki/KKK.