> ...
>South Korea will “push forward measures to review and improve the residency status and visa system for personnel travelling to the United States.”
The implication seems to be that the workers didn't have authorization to work there.
No one ever does, by that standard. In the US, if you're a professional coming in to do some short-term thing, there's no visa process. You just fly in and get the stamp in your passport, which is technically treated as a "waiver of visa". Then you do your job and go home.
Like, have you every flown somewhere to attend a conference and a meeting? Same thing. Where's the "authorization"?
There is a process, it's usually tedious but it exists. I did it for Singapore, the US and Israel. They mostly took multiple months but I never wanted to take any chances. For the US it was a "B-1 in lieu of H-1B" visa for example.
Attending a conference is something different than what these workers did. There are rules around what a "business trip" is and what is not and what "work" is.