The Black Serpents
The Black Serpents were a gang of drug dealers who operated primarily in City Heights. The Black Serpents deal in traditional street drugs (such as coke, meth, and heroin), and also occasionally selling poisons brewed from the venom of their leader, The Black Serpent.
The Black Serpents were wiped out when the vigilante Nightfist destroyed their base to acquire their drug stash. During the fight, Nightfist killed The Black Serpent.