I can tell you some stories Spartacus

I grew up in Canarsie, Brooklyn. Google "Canarsie mafia" and see what comes up
Anyways, the neighborhood I grew up in was the stomping grounds of the Demeo crew. Led by one Roy Demeo. A sick, sadistic maniac. The iceman worked for Roy. They in turn were under the Gambino's, who pretty much controlled our hood.
About 5 minutes from my childhood house was a bar called the Gemini Lounge. It was a regular neighborhood bar by day, but, you didn't want to walk in there at the wrong time

That bar was the iceman's "office".
When you mentioned the book, it brought back a LOT of memories. All of the guys in that book that the iceman worked for were my neighbors. Believe it or not, Canarsie was a GREAT neighborhood up until the late 90's. One of the main reasons was, the "boys" kept the nabe clean. THEY were the ones that sorted everything out. Not the coppers. I used to play in the junkyards of Brooklyn. Lotta bodies are in there. Of course, as a kid I didn't know that. They were my playgrounds.
I even remember the day Patty Testa was killed - he was a part of the Demeo gang (big into stolen cars) - our whole town was shocked. Sadly (but not surprisingly), most of the guys from the old neighborhood are now either dead, incarcerated or have nasty substance abuse problems.
I made it out though. As did a few others
As awful as some of the people were in their "jobs", I knew them as friends and neighbors. It was a special time for a kid to grow up in Brooklyn. If you liked that book, I can recommend a few more for you
P.S. - The Gemini Lounge is now a Baptist Church of all places

Up until last year, I worked about a mile from there.