Shouldn’t the question be how is OUR Government Monitoring them?
Then again, the homegrown Commies our College’s are churning out are probably more dangerous.
When I was at college in the mid-70s, I knew a LOT of Persian students (aka “Iranian”).
The Shah kept an agent of “Savak” or two at every college and loyal students could rat out others to the agent(s), but no one really knew who they were so they were all pretty tight-lipped.
They lived in constant fear of misspeaking, and being disappeared, which DID happen.
One Saturday night you were partying with Farhad, on Monday someone would say “hey, where’s Farhad?” to which there was, typically, no answer.