Schenck v. United States 1919 was a landmark decision case that helped to define the limits and reaches of the First Amendment when it pertains to the right to free speech during wartime.
This decision provided further clarity when pertaining to when the government is allowed to limit free speech.
Charles Schenck was arrested for distributing flyers that urged young men to resist the draft. Shenck was found guilty of performing disloyal acts and being dangerous to national security.