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Technically Imperial slaves (the ones that I always do trading with) aren't really slaves.
Lore wise, Imperial citizens who get themselves into a high financial debt can sell themselves into slavery for a set amount of time to get rid of the debt. Imperial slaves are supposed to get humanely acceptable accomodation, food, treatment, and safe working conditions, in empirial territory, and treating your slaves badly is often said to result to the perpetuator himself becoming a slave.
Having said that, I did once accidentally dump several tonnes worth of the slaves out of my cargo hold, whilst moving at a few dozen times the speed of light, meaning that according to our big friend Albert, they would've literally disintegrated, but that's a part of my cmdr's history I tend not to speak about...