> [...] (yelling "fire" in a crowded theatre) [...]

Please read up on this concept. It does not mean what you think, and is so frequently voiced as part of a case advocating restrictions on speech, it's become something of a hot-button topic.

https://www.popehat.com/2012/09/19/three-generations-of-a-ha...

Money quote:

  After Holmes' opinions in the Schenck trilogy, the law of the United States 
  was this: you could be convicted and sentenced to prison under the Espionage
  Act if you criticized the war, or conscription, in a way that "obstructed" 
  conscription, which might mean as little as convincing people to write and 
  march and petition against it. This is the context of the "fire in a theater" 
  quote that people so love to brandish to justify censorship.

So if you think war protesters should be jailed, then you've found your precedent; carry on. But if you think that notion is heinous, you might want to think again about your example.

You might even want to reconsider your position.