Abrams v. United States

The defendants had been arrested in 1919 for printing and distributing anti-war leaflets in New York City. After their conviction under the Sedition Act, they appealed on free speech grounds. The Supreme Court upheld the convictions under the clear and present danger standard, which allowed the suppression of certain types of speech in the public interest.
The ruling is best known for its dissent by Justice Oliver Wendell Holmes, which led to a gradual liberalization of the Supreme Court's First Amendment jurisprudence. The clear and present danger standard, used in this ruling to uphold the criminal convictions, fell out of favor and was largely overturned by the Supreme Court in 1969. Provided by Wikipedia