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Mass surveillance
In general, censorship in the United States , which involves the suppression of speech or other public communication, raises issues of freedom of speech , which is constitutionally protected by the First Amendment to the United States Constitution . This freedom, though fundamental, has also been accompanied since its enshrinement with contest and controversy. For instance, restraints increased during periods of widespread anti-communist sentiment, as exemplified by the hearings of the House Committee on Un-American Activities . It is also legal to express certain forms of hate speech so long as one does not engage in the acts being discussed, or urge others to commit illegal acts. However, more severe forms have led to people or groups such as the Ku Klux Klan being denied certain marching permits or the Westboro Baptist Church being sued, though the initially adverse ruling against the latter was later overturned on appeal in the US Supreme Court .
Censorship in the United States
Freedman v. Maryland , 380 U.S. 51 (1965), is a United States Supreme Court case that ended government-operated rating boards with a decision that a rating board could only approve a film and had no power to ban a film. The ruling also concluded that a rating board must either approve a film within a reasonable time, or go to court to stop a film from being shown in theatres. Other court cases determined that television stations are federally licensed, so local rating boards have no jurisdiction over films shown on television. When the movie industry set up its own rating system—the Motion Picture Association of America —most state and local boards ceased operating.

