You meet the other side now and then. In my days at the aerospace company, we got an applicant from Russia with really good credentials from the Moscow Institute of Mathematical Sciences. They were really good in person, too. But the decision was "they had to be a plant".

I used to go to parties at Hacker Dojo in the early days of AI. Google wasn't into AI yet and Hacker Dojo had classes, often attended by Google people. (I learned way too much about support vector machines, in a class taught by a guy from BlackRock.) There were a lot of very good looking Chinese women at the parties who were very interested in what people were working on. They were very bright, understood the subject, and had business cards from small companies no one had heard of. Then one day they all disappeared and were not seen again. I regret not asking one how she liked working for the Third Department.