Appellant constituted a legitimate class of one, and this provides a basis for Congress's decision to proceed with dispatch with respect to his materials.

If we are to be as a shining city upon a hill, it will be because of our ceaseless pursuit of the constitutional ideal of human dignity.

If a policeman must know the Constitution, then why not a planner?

Debate on public issues should be uninhibited, robust and wide-open and that...may well include vehement, caustic, and sometimes unpleasantly sharp attacks on government and public officials.

After each perceived security crisis ended, the United States has remorsefully realized that the abrogation of civil liberties was unnecessary.

Our statute books gradually became laden with gross, stereotyped distinctions between the sexes and, indeed, throughout much of the 19th century the position of women in our society was, in many respects, comparable to that of blacks under the pre-Civil War slave codes.

More fundamentally, however, the answer to petitioners' objection is that there can be no impairment of executive power, whether on the state or federal level, where actions pursuant to that power are impermissible under the Constitution. Where there is no power, there can be no impairment of power.