What kind of people cannot immigrate?

Criminal record, party member or something.

But then again, this is a very common problem. Immigrating to America? Or emigrate to China? Haha, those who can't immigrate are better than those who can. You have to have strong financial strength (if you go by yourself, you have no family) or you have to be a skilled immigrant. By the way, the worst thing is that marriage immigrants will soon be basically equal to empty gloves and white wolves. Uh-oh, I hope I helped you.