Back on the Chain Gang
There's a big difference, in my mind at least, between penal labor and chattel slavery. IMHO, the latter is unjustifiable under any circumstances, even post-apocalypse. The former, however, is a perfectly legitimate penalty for serious crimes.
IIRC, the Geneva convention allows captors to employ POWs as laborers, as long as the working hours are limited, and work conditions are humane, but I could be wrong about that.
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