Answer: The mailing of pamphlets advising young men to resist the draft
Step-by-step explanation:
As much as every American is entitled to freedom of speech by the First Commandment, according to the case of Schenck v. United States (1919), that does not apply when the words spoken created a clear and present danger.
This is what the defendants in the case had done when they mailed pamphlets to young men urging them to resist a draft into the U.S. army even though the Americans were now at war with Germany in the first World War.