You could do something about Roy DeMeo and the Gemini Lounge. Ray Liotta played him in Iceman, but it didn't actually show how much of a psychopath sadist he actually was. Also, Richard Kuklinski most likely never actually worked for Roy DeMeo in real life anyway, as Richard was a known bullshitter. That might be a neat movie, a paranoid and possibly delusional psychopath luring mobsters into his bar and cutting them up and shit.