Meatballs sounds like a piss poor name for a gangster, but some folk aren't terribly bright lol.  Joking aside, that's a rather impressive line up, and it makes sense the gangs would have changed with the times.  My personal favorite's Don, just for the whole metal bending trick he's got.  Might have to have Katara have a bone to pick with them, especially if they make the mistake of going after Asami.  Korra wouldn't be too happy either I imagine.