The following information is based on the fact that around 50 years ago, my late husband escorted a South African labor leader around the country for 2 weeks. I met and talked with him several times, and my husband shared much information he learned during their travels. His position in RSA was similar to the head of the AFL-CIO at that time. It was long before the liberation of African lives there. He spoke English, not Africaans (Dutch), so his position was rather delicate. Colored were people of mixed African and white matings. The Indians (from India) were a separate matter altogether. During his time there were severe laws against such mixing, so he described one time when he suddenly realized he was home alone with his African or Colored maid, and immediately told her to go home, with fear that someone might denounce him.
Also during that period we had an Indian friend from Bombay (Mumbai) who told us he could only take $10,000 dollars out of the country. You mention that RSA has similar restrictions today. Obviously, if you can make someone too miserable, they may sell their property for a song just so they can leave if they can get a visa. Trump wants people from Norway to apply to US, but Norway has a better social safety net and schools than we do. Perhaps he would do better if he could persuade RSA to let some of their unhappy white people become legal US immigrants.
I'll explain in FRmail.