You may have heard of the “Countering Violent Extremism” program under DHS.
They’ve deployed the tactics used to fight terrorists against domestic citizens. For example, incels. When I posted on the web forum incels dot is, I didn’t know it was Department of Homeland Security operation against men who say they are romantically deprived. I didn’t know I was interacting with larping feds who encourage extremist rhetoric. Consequently I was put on a watchlist and am subject to intrusive monitoring.
It goes beyond secret surveillance though -- creepy enough as that is. If one were unaware of being surveilled that's one thing but they let you know so they can take credit for "prevention" even if that person wasn't going to do anything wrong. So essentially put in an open air prison without trial.