A term with multiple meanings in the Dark Tower mythos. In Wizard and Glass, it is an alternative name for the Big Coffin Hunters. In Wolves of the Calla, it refers more broadly to the Low Men or can-toi who serve the Crimson King. The name originates from a 1958 cowboy film about vigilantes. Whether called Big Coffin Hunters, Regulators, or Low Men, all ultimately serve the forces of the Outer Dark.