The fastest way would be to get banned. Hence it'll be called "BUSTED" but I'm sure you don't want that.
The only groups you could get in would be Zaibatsu, The Connection, Andolini Mafia Family, The Precinct, $outh $ide Hoodz, Leone Family Mafia or Parcel Force. These are different groups or gangs where people are picked up by leaders. But remember, you have to be a member for quite a bunch of time before you're able to be picked up. You also have to be active in the Off-Topic forums, where, if you'd be a great poster you could be easily picked up by any of these gangs. But, considering your join that, it's a little to early to think about this. At least right now, anyway.