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A man was the Secretary of the Socialist Party of America and was responsible for printing, distributing, and mailing to prospective military draftees during World War I, including 15,000 leaflets that advocated opposition to the draft. These leaflets contained statements such as; "Do not submit to intimidation", "Assert your rights", "If you do not assert and support your rights, you are helping to deny or disparage rights which it is the solemn duty of all citizens and residents of the United States to retain," on the grounds that military conscription constituted involuntary servitude, which is prohibited by the Thirteenth Amendment. For these acts, the man was indicted and convicted of violating the Espionage Act of 1917. He appealed to the United States Supreme Court, arguing that the court decision violated his First Amendment rights.
What is Schenck v. US 1919 case?