Officially the Moonchildren are ex-citizens of the Luna Colonies; lacking employment, they're shipped to Earth. Alcohol's illegal on the Moon, so when they go on Earth, all they do is drink, and go crazy from the agoraphobia, the fear of open spaces they have after being reared in pressure domes. Earth's open sky bother's them, especially when it drops acid rain onto their fragile complexions that make them ugly. They want fresh skin to cover their faces; for that they skin people alive and then all they need is a "graftomatic" and a bent doctorto have a weatherproof complexion. Beinf physically weak from low-G, they have to run around in gangs, giving their victims pre-op beatings.