During that time, Costra Nostra was the most powerful crime syndicate in the country.
Sure there was probably some drug kingpins that were wealthier than some top made guys.
But the strenght of the cosa nostra was not about some individuals being so wealthy. The strenght was that the organization was WEALTHY.
The mafia is not just one name, its a corporation that can fonction even if some members are not there anymore.
Now, in 2021, the mob aint what it used to be. But during the 60s-70s, it was something else.

Sure, you had some organization that had some tension with the mob. But in the long run, the mob got on top.

***in the african American community, you had gangsters like Frank Matthews, the Black Mafia of Philly who were with the NOI, and others. They were strong, but not like the Mafia, who had an all organization