Not entirely sure it is a different Q : the economic equivalent to the Southern slave worker is the factory worker of the Northern USA and Britain, who had more freedom (but, the slavery apologists of the Confederacy would argue, less security, though I understand this claim is thought to be incorrect.)

Thinking about this issue, I wondered about other historical references in sci fi that leave out uncomfortable truths, and thought of Star Trek and the Frontier, which I *think* can be seen as a similar parallel, but doesn't cover the whole 'genocide' aspect so much (so far as I recall).

You'll have to talk to PP about libertarianism: he says I am an anarchist. (shakes head sadly)