I recently picked up "The Bureau: Inside Todays FBI" (well, "today" as in 1994) by Diarmid Jeffries
I was thumbing through what was an undoubtedly dated and slightly trashy book at the 50 cent bargain bin at my local second hand bookstore when I saw it contained a chapter entitled "Rico and wiseguys" as well as a few pictures of 80's era Patriarca gangsters.

Despite it being, as I mentioned, a very dated book, it nonetheless offered some good info on Hoover's legacy at the FBI and a surprisngly good rundown of the events surrounding the William Grasso murder and leading up to the notorious bugged induction ceremony.

It also contained a reference to the longtime Genovese presence at the Fulton Fish Market that is so cheesy it almost makes the whole book worth it (Genovese Fish Pie; Take a labour intensive industry with a perishable product, add a corrupt trade union and throw in a pinch of extortion. Serve very, very cold)