These aren't Italian Mafia books, but I thought they were germane nonetheless.

Comrade Criminal by Stephen Handelman details life in modern (published in 1993, so modern minus about twelve years) Russia after to collapse of the Soviet Union. It tells how the different gangs came from, how they've evolved, and what kind of scams they run. It also deals a lot with political corruption but, because it's in Russia and it's twelve years old, those parts aren't really all that interesting.

Overall Comrade Criminal is a pretty good bood, I'd give it a B-.

And

Red Mafiya by Robert I. Friedman deals with Russian organized crime in the Non-Russian world, mostly in the United States. I liked this one a lot better than Comrade Criminal because it focused more on the United States. The book profiles several different Russian gangsters and goes into detail on their different crimes. It's a pretty scary subject considering the nuclear situation.

I'd give this on a B+.