Gangs of the Underhive contains rules for House Cawdor, House Delaque, House Escher, House Goliath, House Orlock, House Van Saar, Palanite Enforcers, Venator Gangs, and Corpse Grinder Cults, as well as rules for Justicar Courts, Hired Guns, Brutes, Hangers-on and Pets.