those were some pretty tough Jews.
You ever read the book " Tough Jews" ?
There were also a lot of Jewish boxers at one time.
Today there are two decent ones in NY, Yuri Foreman and Dimitri Salita. Foreman had a belt for a while... Salita had some high profile fights but never managed to pull off a big win.
There was also a decent heavyweight named Roman Greenberg sometime back, but I'm not sure what happened to him.
Of course, anyone who knows Krav Maga is a bad ass!