If you haven't read World of Our Fathers. The Journey of the East European Jews to America and the Life they Found and Made - well, then do. Go buy it for yourself as a Kwanzaa present, or buy it for someone else who can be trusted to give it back to you. Trust me on this one.
Somewhere in the book Irving Howe makes a memorable point about the Jews and the Mafia. It turns out a small minority of the millions of Jewish immigrants found their way into the ranks of the Mafia (Meir Lansky was merely the most famous of them). Unlike the Italians, however, the Jewish mafiosi were never followed by their sons, nor by anyone else's Jewish sons. The second generation, the sons of the immigrants, you see, figured out that one could make more money legally than even the Capo do Capi was likely to make, and live longer, so there wasn't any point in joining the Mafia.
Well. Apparently some of the third generation fellows either didn't read Howe, or didn't figure out his reasoning. Not that they re-joined the Mafia, mind you: the money still isn't good enough. But still.