[DiogenesKynikos]

It's worth noting that the phrase "shouting fire in a crowded theater" comes from a Supreme Court case in which the government imprisoned socialists for handing out flyers urging people not to submit to the draft during WWI.[1]

It's one of the most infamous decisions in the history of the Supreme Court, at one of the darkest hours in the history of the First Amendment. I think most people would be surprised to learn how far the Wilson administration went to suppress free speech during WWI. I had no idea until I read "The Great Influenza" (about the 1918 pandemic) recently.

As an aside: the Espionage Act comes from that time, and is the law that was used to jail opponents of the draft back then. It's also the law being used to charge Assange today.

1. Schenck v. United States: https://en.wikipedia.org/wiki/Schenck_v._United_States