[oneplane]

Instead of fighting the symptom you can also fight the cause. If you make the abuse not legal, and detect and enforce that, you solve the problem either way. You'll still need to educate the native citizens of course, otherwise nothing really changes. But you'll need to do both.

I don't know what local laws would apply, but I imagine that the same laws that have to do with equal pay can be made generic so that it applies to everyone for a position. In the end you should be paid for your value, not for your gender, color of your skin or the place you were born.