Red Hood Gang

History
A gang based on mindless violence, the Red Hood Gang was a criminal organization lead by the mysterious Red Hood One. Each member, mostly middle to upper class city dwellers who were blackmailed into joining, was given a red mask and a number, the latter being branded on them with a hot iron.

The Red Hood Gang ruled the city before the first appearance of the vigilante known as the Batman. The gang robbed banks and murdered people, all in the name of chaos.

Year Zero
While in the process of robbing a cargo ship, Red Hood One encountered the Batman. This changed Red Hood One's plans, as well as his life, as he realized that meeting Batman must've been destiny. After escaping the cargo ship, the Red Hood Gang regrouped at ACE Chemicals, where they are began work on a chemical weapon.

ACE Chemicals
During a battle between the Red Hood Gang and Scarecrow, Red Hood One's chemical weapon was destroyed, being replaced with Scarecrow's fear toxin. While attempting to kill Scarecrow, Red Hood One was sprayed, and nearly arrested. With the chemical being a central element to their plan, Red Hood One demanded Philip Kane get them another shipment of chemicals, but he refused.

Wayne Manor
After being informed by Edward Nygma of an event taking place in Wayne Manor, the Red Hood Gang arrived. Red Hood One murders Philip, then attempts to burn down Wayne Manor and everyone inside. Luckily, nobody else was hurt.