This question already has an answer here:
I'm obsessed with the liability Imperial installations seem to carry in terms of worker accidents. (For instance, they build installations where you have insane drops, with no railings at all. We saw this recently I think on Starkiller Base in The Force Awakens.)
Mustafar is especially concerning. I recall a droid skimming on the actual lava on some sort of vehicle that offered scant protection. I know droids aren't considered people, but I got the strong sense biological organisms are working with the same lack of safety measures. (I understand that the natives of Mustafar have thick, heat resistant skins, but that's not going to help all that much if you fall 1000 feet into a river of lava!)
It seems pretty clear that the Empire (and probably the Tech Union, which had possession of Mustafar previously) aren't concerned with working conditions, but:
Was the Old Republic any better than the Empire in terms of worker safety standards?