"a valued part of our constitutional law for decades, and it has determined the result in scores and scores of cases in courts all over this country. It is not an inconvenience to be somehow `weighed' against the claims of police efficiency. It is, or should 316*316 be, an important working part of our machinery of government, operating as a matter of course to check the `well-intentioned but mistakenly overzealous executive officers' who are a part of any system of law enforcement." Coolidge v. New Hampshire, 403 U. S., at 481.
See also United States v. Rabinowitz, supra, at 68 (Frankfurter, J., dissenting); Davis v. United States, 328 U. S. 582, 604 (1946) (Frankfurter, J., dissenting).
Over two centuries ago, Lord Mansfield held that common-law principles prohibited warrants that ordered the arrest of unnamed individuals who the officer might conclude were guilty of seditious libel. "It is not fit," said Mansfield, "that the receiving or judging of the information should be left to the discretion of the officer. The magistrate ought to judge; and should give certain directions to the officer." Leach v. Three of the King's Messengers, 19 How. St. Tr. 1001, 1027 (1765).