Currently reading an excellent book about Steve Flemmi who was a Top Echelon Informant along with Whitey Bulger, Boston Mafia, New England Crime scene. A cant put down book with great stories and pics. The book is basically what Stevie Flemmi told authorities about his over 40 year career in crime.:

http://www.amazon.com/Rifleman-Howie-Car...ywords=Rifleman

Also along the same theme I highly recommend:

http://www.amazon.com/Hitman-Martorano-E...d_bxgy_14_img_z

and

http://www.amazon.com/Black-Mass-Whitey-...2TYJJDJ9KZNNEQA

All 3 are must reads and really exposes just how professional criminals are able to have careers by working with law enforcement.

One more:

http://www.amazon.com/Deadly-Alliance-FB...Deadly+Alliance

The Black Mass book is being made into a movie. Deadly Alliance is THE book that exposed Whitey Bulger and Steve Flemmi as informants.