Library of Congress: Official portraits of the 1976 U.S. Supreme Court: Justice William J. Brennan, Jr.

Lamont, Dba Basic Pamphlets v. Postmaster General

By May 24, 1965

In Lamont v. Postmaster General the Supreme Court declares for the first time that a federal law is unconstitutional on First Amendment grounds. It was also the first case in which the precise phrase “marketplace of ideas” was employed, albeit by Justice Brennan in his concurrence.

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