Had to look those up (because like 99.9% of people, I'd never heard of them) and, surprise, surprise, at least the Popes and Royals are mostly multiracial, and when they started, they began by two "white ethnic" groups: Irish and Greeks. Also, if they're flying out to Hawaii to set up prostitution and drug operations, then they're squarely in organized crime territory, and not a street gang.
This isn't chemistry or physics where a group HAS to have certain qualities and these are neatly organized, but the general trend is pretty clear: the vast majority of street gangs are a product of big cities, poverty, ethnic/racial marginalization.
@Falsedawn