Regulators

Lead by the sadistic Caleb, the Regulators are a vicious gang that serves as the "police force" of Adytum. Nominally under the authority of Adytum's mayor, Jon Zimmerman, they in fact manipulate Zimmerman and control Adytum's affairs, ruling harshly, expropriating a good part of Adytum's industrial wealth for themselves, and enforcing forced labor on Adytum's citizens. To legitimate their authority, they have claimed that the Blades, a survivalist group to the north, are a threat, and frame them for crimes such as the murder of Jon Zimmerman's son.

In Fallout 3, the regulators are a group of vigilantes, who wear cowboy style hats and dusters and live in a farmhouse. If the player has the lawbringer perk, they can bring them fingers taken from the corpses of evil humans killed by the player, for good karma and 10 caps. The Regulators are also the group who attempt to claim the bounty on the player's head if he or she chooses to detonate the bomb in Megaton.

In Fallout 3 if you play an evil character you will randomly encounter squads of regulators who try to kill you. They are trying to collect a bounty on your head. If you kill them and search there bodies they will have a audio tape named bounty notice: (your name). They appear to travel in squads of 3 and carry energy rifles. They all wear regulator dusters for armor which have the same stats as the sheriffs duster from megaton

Appearances in games
The Regulators appear in the original Fallout and in Fallout 3.