What I didn't learn until recently was the "yelling fire in a crowded theater" was the analogy applied to pacifists opposing the draft in WWI (https://en.wikipedia.org/wiki/Shouting_fire_in_a_crowded_the...). It was a bad ruling but the analogy itself stands.

So in that vein, should incitements for violence against the opposing party be unfettered free speech? At what point does it go too far?