The rumor was he killed 8 Genovese made men after he got out of prison. I don't believe it though. They blamed every mob/drug hit on him after he got out.
I believe he was killed for not sharing the drug profits.
I think they lost their seat during the Bananas War and again after the Galante/Brasco fiascos.
The Concrete Club included everyone except the Bonannos.
The Windows Club only included the Genovese, Colombos and Luccheses. I think Gotti tried to horn in but was told by Gigante to fuck off. None of the Gambinos or Bonannos went to prison.
I don't think the Bonannos took part in the fuel tax scam either.
They missed out on alot of money. I guess that's why they were cracking open parking meters.