Best I can come up with is that if the conditions are too bad then it’s human trafficking.

In both case they “consent” to do labor, however human traffickees are often tricked into a more casino-like raw deal.

In both cases, it’s not uncommon to not be unable to quit the job.

Source: I know a lot of migrant labourers

  • well for certain in some circumstances–for example in Qatar and other petrostates–there really isn’t a difference between the two. most migrant workers to such states are effectively treated as disposable slave labor and are often coerced there under false pretenses and then held there by force until their contracts finish