I just finished reading this book last month and then heard they were releasing the movie soon. It was quite gripping. One of those books you can't put down. Richard Kuklinski was a true psychopath! Also, Ray Liotta is always a great mafia/mobster character.
http://www.youtube.com/watch?v=CJIXOx2-GZ8
http://www.youtube.com/watch?v=CJIXOx2-GZ8