I recd an email stating that the Jewish Mafia back in the 40's, fought anti semitism right
Here and esp the nazi's in America and the bunts, etc. Do you think there's any truth
In that?

Hi, jammie232!

Was the email from someone you don't know?

Thanks!

No, I knew the person who sent it but I don't trust it was accurate.
Couldn't find it on Snopes.

Actually it is partially true. Read up on Mayer Lansky. He was Jewis and played a major role in what is known as the "Italian Mafia". Since he was Jewish he couldn't officially be "Boss" but behind the scenes he was running the show along side Lucky Luciano. Mayer was known to break up rallies held by Nazi sympathizers.
During World War II, Lansky was also instrumental in helping the Office of Naval Intelligence's Operation Underworld, in which the US government recruited criminals to watch out for German infiltrators and submarine-borne saboteurs.
According to Lucky Luciano's authorized biography, during this time, Lansky helped arrange a deal with the US Government via a high-ranking Navy official. This deal would secure the transfer of Lucky Luciano to a minimal security prison; in exchange the Mafia would provide security for the docks in New York Harbor. German submarines were beleieved to be entering the harbor at this time undetected, and there was great fear of attack or sabotage by Nazi sympathizers.
I quoted most of this from http://mafia.wikia.com/wiki/Meyer_Lansky so if you're interested you can read up on it.