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  In two cases decided more than 30 years ago, this Court referred broadly to a constitutional privacy “interest in avoiding disclosure of personal matters.” Whalen v. Roe, 429 U.S. 589, 599-600, 97 S. Ct. 869, 51 L. Ed. 2d 64 (1977); Nixon v. Administrator of General Services, 433 U.S. 425, 457, 97 S. Ct. 2777, 53 L. Ed. 2d 867 (1977). The Constitution protects a privacy right of the sort mentioned in Whalen and Nixon. The Government's interests as employer and proprietor in managing its internal operations, combined with the protections against public dissemination provided by the Privacy Act of 1974, ...