[overlordalex]

Even more cromulently:

In Dennis v. United States the government jailed the leaders of the american communist party, and the supreme court upheld the conviction.

And if it's said that it's justified because they were the leaders: in Harisiades v. Shaughnessy the supreme court ruled that immigrants can be deported for being a previous member of the communist party, not even in any sort of leadership position. This includes just being a member for a year or two several decades ago.

You can make the argument that those were cases from the last century, so how about being arrested for exercising your first amendment in the wrong place: https://en.wikipedia.org/wiki/Free_speech_zone

For something even more recent, protesters attempting to stop a massive new police training center* are being charged with domestic terrorism

*https://en.wikipedia.org/wiki/Stop_Cop_City

While there is definitely plenty of latitude around "free speech" in America, it's not limitless and the government will happily jail you if they disagree with what you're saying.

This is not even getting into topics like COINTELPRO