Thomas 'The Chinaman' Sinito. His matter of fact approach to murder really scares me. It's when guys have the attitude that somewhere down the line, their friends might be informants that really scares me. His decision to murder David Perrier is really terrifying, and he exhibited Gravano-like behavior, lying about his worker's misdeeds to have hits placed out on them and take over more and more of the underworld.

After years of research I've concluded Fiore 'Fifi' Buccieri was the most terrifying of the terrifying outfit guys. He choked Tony Spilotro half to death with his bare hands and had a weird fetish for torture with a cattle prod.