Lawbringer

Lawbringer is a perk in Fallout 3.

Description
The Lone Wanderer will get a note from The Regulators telling them that they "require their aid in bringing the scum and pestilence that inhabit our home to justice" and ask the player character to report to Sonora Cruz at Regulator HQ for details. Sonora Cruz, the leader of the Regulators, will pay the Lone Wanderer for each "evil" person brought to justice (killed) and requests their fingers as proof. She will pay 5 Caps per finger unless one has 750 or more Karma, at which point she will pay 10 caps per finger. This is determined by one's Karma before the turn-in. Each finger turned in will net the Lone Wanderer 10 Karma, regardless of current Karma. If one is below 750 Karma and have more fingers than would get them there, the excess can be dropped, turning in fingers until one gets to 750, then picked up and turned in with the rest to benefit from the increased cap reward.

Bugs

 * Sonora Cruz can’t take more than 999 fingers at a time. If you have more than that in your inventory when delivering, she only takes 999 but still rewards you for all of the fingers (12,800 caps for 1,280 fingers with very good Karma, for instance). You can deliver the remaining fingers for more Karma and caps.
 * It is possible that Sonora Cruz will run away from the Regulator HQ and will not return. Fast traveling to the HQ often spawns various combinations of hostile creatures and/or robots. They are normally busy killing the Brahmin outside the HQ, however they engage you upon your arrival. If you enter the Regulator HQ before killing the hostiles, all of the Regulators, including Sonora Cruz will flee from the area and not return. She can usually be found outside, or can be brought back to the HQ by using the console. Once the hostile creatures are killed, she will usually talk to the Lone Wanderer again, but sometimes must be disabled, then re-enabled to reset her scripts, or she will be continuously fleeing. It should be noted that if you kill whatever is outside before you enter the Regulator HQ, Sonora Cruz will not flee.
 * Even with the Lawbringer perk, if your Karma has reached Evil or Very Evil, Regulators in the HQ will hold a bounty notice saying that you're a dangerous person who is to be shot on sight for a reward of 1000 caps. This does not affect the behavior of the residents of the Regulator HQ, only that of the Regulators sent to bring you in.