There is already an underclass of immigrants, those on H-1 visa (work visa), with all the restrictions of their position (employment restrictions, conditions on

There is already an underclass of immigrants, those on H-1 visa (work visa), with all the restrictions of their position (employment restrictions, conditions on the length of stay in the country, and so on). Also students (F and J visas), severe restrictions on work, sometimes a requirement to leave the country (USA) and never show up for two years. Probably more cases like that, these are just the ones I had to deal with.