Manhunters

The Manhunters were the first attempt of the Guardians of the Universe to create an interstellar police force that would combat evil all over the cosmos. For thousands of years, they served the Guardians well. However, the Manhunters became obsessed with the act of "hunting" criminals. Their code, "No man escapes the Manhunters" (corrupted from the original), became more important to them than seeing justice done.

Eventually, the robots conspired to rebel against their masters, but the Guardians defeated and destroyed most of them. Those that survived hid away on many planets, slowly rebuilding their forces and spreading their beliefs to others. Since then, the over-riding goal of the Manhunters has been to take revenge on the Guardians, as well as on their replacements, the Green Lantern Corps.