Free speech

Even in liberal democracies, there are differing views of free speech. Nations with the greatest tradition still restrict things that are an immediate danger, as Justice Felix Frankfurter wrote in the unanimous opinion of the Supreme Court of the United States in the 1919 case, Schenck v. United States, "The most stringent protection of free speech would not protect a man in falsely shouting fire in a theatre and causing a panic."

Freedom of thought
Article 18 of the Universal Declaration of Human Rights (UDHR) does freedom of thought, conscience and religion, including the right to change religions and to practice one's religion. This is not universally accepted, Based on the right of freedom of opinion, Article 19 state a right to transfer "information and ideas through any media and regardless of frontiers."

Clear and present danger
UDHR Article 20 states a right of peaceful assembly and association, and denies compulsory membership in associations.

Schenck v. United States further said, "Words which, ordinarily and in many places, would be within the freedom of speech protected by the First Amendment may become subject to prohibition when of such a nature and used in such circumstances a to create a clear and present danger that they will bring about the substantive evils which Congress has a right to prevent. The character of every act depends upon the circumstances in which it is done." The Court later refined its definition:"These later decisions have fashioned the principle that the constitutional guarantees of free speech and free press do not permit a State to forbid or proscribe advocacy of the use of force or of law violation except where such advocacy is directed to inciting or producing imminent lawless action and is likely to incite or produce such action."