Brandenburg v. Ohio (1969)
Decision that the Ohio Criminal Syndicalism Statute ignored protected free speech, whether or not the advocacy it criminalized actually led to imminent lawless action, violating of the Constitution.
Miller v. California (1973)
Decision that obscene materials are not protected by the First Amendment, but the definition of "obscene material" is lessened.
Texas v. Johnson (1989)
Decision that struck down state laws prohibiting the desecration of the American flag.
New York Times Co. v. Sullivan (1964)
Decision that the First Amendment protects publications, like the NYT, of all statements, even false ones, about the conduct of public officials, except when statements are made with actual malice
New York Times Co. v. United States
Decision that prior speech restraint of a publication, like the NYT, is unconstitutional. Justice Black wrote, "Only a free and unrestrained press can effectively expose deception in government..." referring, in this case, to the Nixon administration.