A number of refugees fled because they helped the US in important ways. They intentionally helped specifically us.
But the North was petty, and if you didn't actively demonstrate your loyalty to them before they took over the South, did things like traded with or worked with Americans, you were tainted and needed re-educated. They didn't "help us" so much as just run their business or take a job that involved doing stuff with Americans.
And a lot of people just fled because they weren't properly revolutionary. They had businesses. They were involved with the South's government. They were politically suspect not because of what they did for or with the US but because of what they did for themselves. Had a store? Bourgeois pig, you will be punished for your oppression of the people. You spoke or wrote things against the Communist regime in the North? You're a traitor of the people and must be made to suffer for your perfidy.
Many just fled not because of those three reasons, but because they figured it wouldn't be pretty under the north. That might be workers, might be criminals, might be whoever. The South's government was corrupt, but the North's was quasi-Stalinist. Between Hitler and Stalin, since I wasn't one of the groups Hitler had his (rifle)sights set on, I'd choose to live under Hitler; he didn't care about nearly as much about what you thought as long as you obeyed and didn't say you wanted to overthrow him. Stalin insisted that the right thoughts accompany the right actions, and punished thought crimes against whatever the stupid idea of the day was.
The first wasn't a large group. The second and third were large. I have no intuition for the fourth, but it strikes me that there's likely a large overlap between it and group 3.
The group being targeted here is just the same group that would normally be subject to deportation if they were, say, Argentinians or Koreans. If you're an immigrant and run afoul of the law, there are specific crimes that trigger deportation, some "might" and some "will". We deport Germans, we deport Russians, we deport Nigerians and Indians and Brazilians, but we haven't deported Vietnamese who do these things if they immigrated in or before 1995.
Doesn't strike me as a large group, except to the extent I think that Trump is likely to say, "Aha! You removed that tag from the mattress before it was sold, you're not pale enough, off to Hanoi with you!"
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