His uncle Dr. Morton W. Levine ...., provided medical assistance to members of the Lucchese crime family, “which aided their illegal activities,” according to a sworn affidavit in 1993 from an F.B.I. special agent. The agent was involved in the investigation of the Lucchese underboss, Anthony (Gaspipe) Casso, who “regarded Levine as someone who would do anything for him,” according to the affidavit. That account was buttressed by testimony from a longtime Lucchese associate in an unrelated 2006 federal trial. In 1992, Dr. Levine bought Mr. Casso’s home while Mr. Casso was a fugitive. Dr. Levine has acknowledged in court documents that Mr. Casso was a patient. But he said he did not know that the house belonged to Mr. Casso and denied any wrongdoing.

Dr. Levine also owned El Caribe, a Brooklyn catering hall that for decades was the scene of mob weddings and Christmas parties. Two of New York’s most notorious Russian mobsters once maintained offices there.