Discrimination will always be the scar of America for one and cultural fault zones occur sporadically. But when we speak criminal underworld it's about business and that can overlap but not always with cultures. Also take into consideration of propaganda like @Extortion ( bigotry, smh). Of course not all Italian Americans are biased; Al Capone didn't mind blacks and he even attended a black church on the south side of Chicago, Lucky Luciano did business just about with anyone, and majority of posters can name others,East European groups have work with black racketeers/ gang members, and let's not forget that every major Italian/ East European crime groups have done business with Nigerians. It always come down to individuals and the culture that they was raised.

@Antonio, Decent deduction. There are many black fraternities that was formed back in the late 1800s and early 1900s that are still active today, some international and the rest regional to locally. In we have a secret society (not referring to prince hall masons) but to my knowledge not criminal. As far criminal wise; it's based around activity like numbers, bootlegging, loan sharking, drug trafficking syndicates and our gangs are mostly formed due to hostile greaser gangs (not all of course)/ discrimination / freelance criminals. BGF is the only group that's blended in black culture.