Do you happen to know what the case was when the "fire in a crowded theater" meme was coined? Look it up.
It's not to your credit to perpetuate it.
Yes, and also the one that overturned part of the ruling in the late 60s iirc.
However, though the ruling was overturned as (iirc) not equivalent to the act mentioned (as passing out handbills, making internet boards for unpopular political positions and stuff between), the concept that free speech does not include the right to incite a riot/frighten people into thinking there is a fire when there is not one so they rush to get out and many die, etc. does continue in law. Hopefully that clears things up.