The Limit of the First Amendment

Two people were distributing leaflets in the run up to world war one, saying, you should disobey the draft because war is bad. The government arrested them, and the supreme court said, that's cool. You can limit their speech as they are creating a clear and present danger to the united states of america. That was the metaphor. And then this was later overturned, if i remember correctly. So not only was it not a thing that happened, it was a metaphor for a thing that isn't even current.