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The people, the ultimate governors, must have absolute freedom of, and therefore privacy of, their individual opinions and beliefs regardless of how suspect or strange they may appear to others. Ancillary to that principle is the conclusion that an individual must also have absolute privacy over whatever information he may generate in the course of testing his opinions and beliefs.

"Branzburg v. Hayes, 408 U.S. 665". U.S. Supreme Court case, supreme.justia.com. June 29, 1972.
The people, the ultimate governors, must have absolute freedom of, and therefore privacy of, their individual opinions and beliefs regardless of how suspect or strange they may appear to others. Ancillary to that