A few years ago I was one of only a couple of American engineers in a department in which all the other employees would put up with anything to avoid being sent back to their homelands. The manager was incompetent bordering on criminal; and I was in the position of being the only one who would stand up to him.
This issue doesn't get as much attention as the issue of high-tech jobs being earmarked for whoever will work for the lowest salary; but it's common enough that there's a term for it in the industry: "indentured servitude".