WikipediaExceptions to free speech in the United States refers to categories of speech that are not protected by the First Amendment. According to the Supreme Court of the United States, the U.S. Constitution protects free speech while allowing for limitations on certain categories of speech.Categories of speech that are given lesser or no protection by the First Amendment (and therefore may be restricted) include obscenity, fraud, child pornography, speech integral to illegal conduct, speech that incites imminent lawless action, speech that violates intellectual property law, true threats, and commercial speech such as advertising.
https://en.wikipedia.org/wiki/United_States_free_speech_exceptions