The First Amendment guarantees the right to free speech unless it is inciting, such as 'go and rough up some [fill in the blank]' because King George III of England would not tolerate criticism and dissent from the colonists. Ppl are protected by that even when they are being hateful.
Actually such legal sentiments weren't really defined so clearly until the 20th century with a series of landmark Supreme Court decisions, from Schenck v. US to Hustler Magazine v. Falwell. A series of evolving decisions that formally defined and limited the rights of free speech, press and assembly and then gradually broadened them over time.
Example: Brandenburg v. Ohio 1969 - where the court determined that an Ohio statute cannot punish inflammatory speech by the Ku Klux Klan unless it leads directly to incitement of an imminent, lawless action.
It effectively gave political extremism a legal voice. Later precedents would extend such rights to assembly as well. Not sure how the Founding Fathers would have felt about the KKK or Nazis...or pornographers who would ultimately expand such rights. Though it might have been amusing to hear their thoughts over the obstruction of conscription (Schenck v. United States) which would establish the court's Doctrine of a Clear and Present Danger (1919).
Brandenburg v. Ohio
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