i get what you mean but that particular scenario even if it was possible would eventually implode on itself.

also it was the actual street gangs and hoodlums that sort of drove white mobsters out black areas during late 60s and 70s by robbing numbers operations and taking control of the drug trade in large areas(nicky barnes, frank matthews, pstones etc ).

the mafia mythology and imagery is mostly what alot of these rappers, gangbangers and drug dealers admire more than the actual people. Black mafia family doesnt really mean much because evry crime group gets called a mafia these days. Remember the philadelphia black mafia, although they structured their group like the mob they were furthest from being their fans, most of them were black muslims who alligned themselves with the nation of islam. With the rappers alot of the people around them get paid to be there.