e.g [flagged] Target director's Global Entry was revoked after ICE used app to scan her face [>>46833871 ]
Stuff like actively expressing opposition to taking them on as a customer, trying to persuade management to do otherwise, and so on would all be perfectly kosher. But the stuff the top post in this thread alludes to, let alone what it links to, is how you end up in prison for a very long time after the 'I didn't know it was illegal' defense fails.
There is no in group, out group, or whatever else. Go to Mexico or Canada illegally, as an American, and you're getting deported, same as everybody and everywhere else. Vice versa if a Canadian, Brit, or whoever else comes into the US illegally, they're also getting deported.