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.

According to an IGN interview, in Fallout 3 players can join the Regulators if they have high enough karma to take the "Lawbringer" perk. This enables players to earn extra money and karma by bringing in the severed fingers of evil characters for a bounty.

Appearances in games
The Regulators appear in the original Fallout and are slated to be a faction in Fallout 3.