The author has explored his subject with numerous sources and writes extremely well. In order to tell the story of the Irish gangs, he also tells a large part of the history of the other American gangs as they were all tangled together at most times in our country's history. Although it doesn't really fit into the story of the Irish gangs, English claims JFK was killed by the Italian mob. He doesn't do anything to support the claim though. To me it seems like the mob may have wanted to kill him but didn't get around to it before Oswald. Mob conspiracy theories are not the most logical explanation. That makes this reader wonder if all other "facts" in this book are absolutely true. It is unfortunate that the book came out just a short time before Whitey Bolger was apprehended. It would have wrapped up the whole story. Not at all the author's fault, of course.