They are enemies of the Mag'har and the Kurenai. Killing them will yield 2 or 10 Mag'har reputation for Horde players and 2 or 10 Kurenai reputation for Alliance players. They are hostile to both the Alliance and Horde.
They are led by Swamplord Musel'ek who rules from the Underbog in Coilfang Reservoir.
These Murkbloods have been enslaved by the Dragonmaw Clan and are mining in the mines on Netherwing Ledge. They have made an alliance with the Netherwing dragonflight.