Ghost People

The  are a faction in the area surrounding the Sierra Madre.

Background
Protected by Hazmat suits, yet morphed into something no longer quite human, the Ghost People are the only ones to walk the Cloud. Anyone who isn't savagely killed is dragged away, to a fate that, while uncertain, is probably much worse than dying in the streets.

To be properly killed, a Ghost Person needs to be completely decapitated.

Appearances
will appear in the upcoming Fallout: New Vegas expansion Dead Money. From the picture (above), it looks as though they use a type of bear-trap fist, possibly a new equippable weapon.