It is funny you bring up “fire in a crowded theater”, that is the perfect example to prove my point.
The “fire in a crowded theater” analogy was first used by Supreme Court Justice Oliver Wendal Holmes, but the “fire” was actually anti-WW1 pamphlets and the “theater” was actually a public street. So the leftist handing out anti-war pamphlets was jailed.
But you’re right, the first amendment does not protect you from the ramifications of your speech. Someone yelling in a theater should be met with a disorderly conduct charge, and nazis in the streets should be met with organized antifascist violence. Death threats that pass a reasonableness standard are prosecuted as felony harassment. Death threats that do not pass this standard are protected under the first amendment.
But in my opinion, there is no crime that warrants being sent to Guantanamo. A lifetime of torture is a fate far worse than death, and there should be no room in a civilized world for such barbarism.
Because the DNC is structured explicitly to prevent progressive challengers.
There are many examples, but one big one is the DNC vendor banlist. The DNC says that any vendors who work with progressive primary challengers will be banned from any future work with the party.
This means that progressive challengers often cannot find vendors to do basic things like print flyers and signs, and finding experienced staff to hire is nearly impossible. And of course, “centrist” candidates have not been bothered by this.
And then at the top of the DNC you have hundreds of superdelegates and party officials who are overwhelmingly center right or rightwing. These people cannot be voted out directly.