The Mafia

The Mafia is a large gang that runs the less reputable business practices around Gatestone.  

Entertainment Guild

The pit fights are one such business, verging on the edge of legality (even only barely if you look at the 'paperwork'). They are headed by the Red Don (usually seen wearing a blue cape), he can often be found at the Pits, making sure any newcomers don't mess with his setup fights too much, or to make sure they get recruited. As well as pit fights, they also head many of the gambling dens around and some of the brothels and drug parlors.  

'Security' Guild

The Security guild is about security as much as banks are about helping the poor (they don't). If you want 'security' from the Guild, however, they will be more than generous enough to come up with a contract, and if you are generous enough they may even make sure other thieves don't rob you either. This group is headed by the Blue Don (you guessed it, usually wearing a red cape).  

The Dons

It's not known to the public how many or which Dons run the Mafia, only two (the red and the blue Don) are known publicly.