Summary: https://www.hooyou.com/b1-visa/b1-activities.html

I myself once worked for a large German company at a large US software company, porting code to my company's platform. After a few flights back home to Germany and back immigration took me into the backroom, and I described in detail what I did. They stamped my passport and let me in for another 6 months of that work. I did that for a year before switching to another visa. It also worked out because I never even tried the slightest evasion and gave them everything I got, it's not like I cared, if I had been sent back, so what, I had no desire to immigrate. I'm sure under the exact same circumstances somebody giving them a worse impression of hiding something might not have been approved. But in any case, it's definitely legal, you CAN do some kinds of actual work on just a B1, even for an entire year.

It was legal, because I still was 100% employed and paid in Germany, and the job could not be done otherwise, the US company would not send us their source code.

Similarly, in the context of the Korean raid.

One other important point you neglect is that from what I read the legality of the activities were never even questioned to begin with! They simply arrested everyone. They did not know what they wer4e doing, they just needed the arrest numbers because ICE is under pressure themselves. They did not even have any interpreters. That makes any argument about the legality useless, since it didn't even matter for the arrests.

I don't generally favor Trump's policies or the opposition's. Yet it is impossible to have a discussion here without providing explicit disclaimers. Even with those disclaimers, we're constantly brigaded with red-herrings, non-sequiturs and ridiculous claims tilting at what is incorrectly perceived as Trump support.

It is difficult to even criticize Trump's policies, unless the criticism is one of the curated forms prescribed by the outrage-o-sphere.