Joey was a real contract killer, but not a Mafioso. He just did some work for them from time to time. Not an unusual situation. He died some years ago from natural causes. His obituary was in Time Magazine. This book appears to have been put together from Fisher's notes without Joey available to fill in the holes. Fisher had to ad-lib some facts, but did not have specific knowledge. For instance, when Joey smelled trouble he took the safety off two of his .38s. Revolvers do not have external safeties, and no hitman would use a semi-automatic (which has an external safety), even if reliable .38 semis were available in the '50s and early '60s. There is always the chance of a misfire, and with a semi one has to go thru a clearing drill to get off a shot. With a revolver one has merely to pull the trigger again. Also, tailing someone as Joey did it would get you made within a very short time; and; no phone tap would be be done in such a dangerous way. But if you read the book carefully and between the lines, there is some good information. Is the book worth reading? I say Yes.