The article didn’t point out anything about trade negotiations or fealty. It is an immigration issue.

"Agents with Homeland Security Investigations said the majority were Korean nationals, though others were from different countries. Some, officials said, had crossed into the US unlawfully; others had overstayed visas; still others were on visa waivers allowing entry for tourism or business but do not permit employment. "

Follow the rules, that is society works. It seems to be an article geared to left wing people who don’t believe in laws if it doesn’t fit their world view. You are in America.