That kid's name was Moe Greene.

Not really, but it could have been the actor that went on to play Moe Greene, Alex Rocco or Alexander "Bobo" Petricone, as he was known back then. He was a charter member of Whitey's Winter Hill Gang, and one of the instigators of Boston's Irish gang wars of the 60's.

Check out the link - http://www.wikipedia.org/wiki/Winter_Hill_Gang