What about "The Brotherhoods: The True Story of Two Cops Who Murdered for the Mafia" by Guy Lawson and William Oldham? Is it good?
I thought it was a great read, the best of the bunch on the subject. I read "Mafia Cops" and "Friends of the Family," but the "Brotherhoods" were better. Tommy Dades is kind of a douchebag at times.