Kuklinski is full of shit.

I'd say Roy Demeo, Felix Alderisio, Mad Sam, Machine Gun McGurn, Harry Aleman, and Marshall Caifano deserve more of a look.

Also, assuming he's telling the truth, Frank Sheeran out of Upper Darby deserves mention. Possibly involved in two of the most notorious murders in mob history, completely unconnected. My dad knew him personally and said he was definitely capable of them at least.