Have you seen The Irishman? There’s a scene where Don Rickles (played by comedian Jim Norton) is performing at the Copacabana for mobster, Crazy Joe Gallo - on the night he was gunned down. The incident is pretty true. And Don Rickles, much like other comedians of that era, had a history of working at clubs owned by the mob.
We jumped into Don Rickles history with the mob - that eventually led him to a role in Scorsese’s Mob film: Casino