Anyone remember Heinlein's "The Moon is a Harsh Mistress"? There were two main cities, one run essentially as an open prison by a future version of the UN, and one called "Hong Kong Luna", which was a modern free society.
Interestingly enough, when the free citizens of the moon revolted, they won by tossing steel canisters full of rocks at Earth. Pretty damn plausible with technology that we already have in large part.