I used to pool this question regularly Over There and the answers were always amusing.
Pop Quiz: What was Charles Schenck saying that Judge Oliver Wendell Holmes thought was so dangerous that it was the equivalent to "Shouting fire in a crowded theater?"
@USConst_Amend_I @antares Distributing anti war flyers?
Spoiler
@the_cleric @USConst_Amend_I pretty close. He was distributing flyers protesting the draft.
@antares every one of my followers knows this😂