I've known a grad student that was admitted to a very prestigious US university, and came from a country which was unjustly invaded by the US. When he was about

I've known a grad student that was admitted to a very prestigious US university, and came from a country which was unjustly invaded by the US. When he was about to come, his visa was denied/indefinitely delayed, and they eventually admitted that the reason was that they made derogatory posts on social media as a result of that invasion.