I'm not sure about Madame St. Clair. At the time of Dutch Schultz's death she had already lost her numbers and gambling business to the Schultz organization.
Her successor, Bumpy Johnson came to an "understanding" with the people who took over for Dutch Schultz. This would have primarily been elements of the Gagliano and Luciano Families.
Bumpy watched over the Mob's interests in Harlem, mediated any troubles and turned over a certain tribute. In return he was free to run Harlem with a minimum of interference. It was probably the best deal he could get at the time.
People who came after him didn't see the need for such deals.
By the time the eighties arrived people like Freeway Rick had setup their own suppliers, importation and distribution network and had no contact with traditional organized crime.
"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming
Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.
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