Masterminds

History
The Masterminds are the criminals that control the underworld of Gotham City.

Penguin rules the arms market and has an arrangement with Batman that keeps him in power (and Batman uses the Birds of Prey to keep Penguin in check by feeding them tips about Penguin's supply line).

Black Mask and Great White Shark are men of many talents and rule the west and east sides respectively, doing protection rackets, illegal gambling, and selling drugs.

Joker has Amusement Mile and Park Row, but he doesn't really have any agenda. He occassionally tells his goons to go rob a place or shakedown some ma and pop for cash. He keeps the territory as it gives him the right to attend the Masterminds Meetings which have become a favorite pasttime of his (he usually brings popcorn).

Riddler contracts himself out to the crime lords of Gotham for a cut of profits and all Masterminds pay him a cut to serve as mediator in their meetings.

Two-Face rules Old Gotham and the Southside. He also does protection rackets.

Trivia and Notes
Rupert Thorne is around; Carmine Falcone is out of prison and rebuilding his empire. There are the mobs and street gang too. Lots of crime to go around in Gotham.
 * Arnold Wesker and Sugar (or maybe it is Scarface himself...) do not recognize the Masterminds and thus their gang are usually at war with one or more of the Masterminds, except Joker. Scarface doesn't like to mess with the Clown, ever since the Clown put his hand up the dummy's backside, Scarface keeps a wide berth from that psycho.
 * The Maserminds are not the only crime lords in Gotham, just the ones that have some an understanding.

Links and References

 * Appearances of the Masterminds
 * Team Gallery: Masterminds
 * Membership of the Masterminds