The correct answer to this open question is the following.
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There are documents that refer to the way some politicians abuse their powers and immunity in the United States Congress.
In the times of the Cold War, Congress and other levels of the federal government affected discussions of freedom in the early 1950s because, during the Red Scare wave of accusations, many people were suspect of being Communist or anarchist and were treated badly.
It was a time when Wisconsin Republican Senator Joseph McCarthy accused many members of the US federal government and the military of being Communists, although he just accused, never show any evidence of it. However, the accusations ruined the reputation of many people.
So although the US has always been proud of its liberties and freedom of speech, there had been times in which when those freedoms were attacked or suppressed.
