The article is ridiculous. The reason the Mob was so strong was they were deeply ingrained in the old ethnic neighborhoods. They were able to fit in to legitimate society by giving money to the church, doing business with (and trapping in debt) legitimate business men, they were really entrenched in the community. They can't just drop into a strange neighborhood and announce they are taking over. They would face immediate reprisal from the local gangs. And the cops would be on them right away too, because wiseguys would stick out like sore thumbs in an all black neighborhood.