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Exceptions to free speech in the United States are limitations on the First Amendment's guarantee of free speech and expression as recognized by the United States Supreme Court. These exceptions have been created over time, based on certain types of speech and expression, and under different contexts. While freedom of speech in the United States is a constitutional right, these exceptions make that right a limited one.
Restrictions that are based off communicative impact include both instances of a complete exception, and cases of diminished protection. Speech that involves incitement, false statements of fact, obscenity, child pornography, offensive speech, threats, and speech owned by others are all completely exempt from First Amendment protections. Commercial advertising receives diminished protection but that still means that there is some limit on government intervention.
Along with communicative restrictions, when the government acts as subsidizer or speaker, is an employer, controls education, or regulates the mail, airwaves, legal bar, military, prisons, or immigration, less protection is afforded for uninhibited speech.