Ignorance is truly bliss. Gangs attract and recruit people exclusively within their own ethnicity. See many Caucasian guys rolling with the Latin Kings or the Crips or vice versa.  Gangs appeal to the disaffected, the weak followers, a smattering of asocial and sociopathic personality types, and people who generally come from poverty, dislocated and dysfunctional families, and identify with grievances. The ethnic component reflects their homogeneity of thought, identity, and shared grievance.  

KKK, WN, etc. are simply gangs. They engage in aberrant behavior and venture into criminal enterprises to fund their activities. If we look at the psychological profiles of any members of the aforementioned, we see identical patterns. When members of black or Hispanic or Latino or Caucasian gangs refer to each other as "brothers" only the Caucasians are racist? You must work for CNN......