You guys still are missing the mark.  KKK and the like are a gang, no different than the 30,000 other gangs in the US.  Bikers have a gangs, inter cities have gangs, I would argue ISIS is a gang.  A gang is not about the message, it's about some combination of (personal security, feeling of belonging, and likely low intelligence).  There are 1.4M people in gangs according to the FBI.  Take a look at who is really killing minorities, it's not a bunch of white hillbillies.   

http://www.statisticbrain.com/gang-statistics/