828
Opinion of the Court
crimination against petitioners' speech, and that the University's Establishment Clause concern over its "religious activities" was a sufficient justification for denying payment to third-party contractors. The court did not issue a definitive ruling on whether reimbursement, had it been made here, would or would not have violated the Establishment Clause. 795 F. Supp. 175, 181-182 (WD Va. 1992).
The United States Court of Appeals for the Fourth Circuit, in disagreement with the District Court, held that the Guidelines did discriminate on the basis of content. It ruled that, while the State need not underwrite speech, there was a presumptive violation of the Speech Clause when viewpoint discrimination was invoked to deny third-party payment otherwise available to CIO's. 18 F. 3d 269, 279-281 (1994). The Court of Appeals affirmed the judgment of the District Court nonetheless, concluding that the discrimination by the University was justified by the "compelling interest in maintaining strict separation of church and state." Id., at 281. We granted certiorari. 513 U. S. 959 (1994).
II
It is axiomatic that the government may not regulate speech based on its substantive content or the message it conveys. Police Dept. of Chicago v. Mosley, 408 U. S. 92, 96 (1972). Other principles follow from this precept. In the realm of private speech or expression, government regulation may not favor one speaker over another. Members of City Council of Los Angeles v. Taxpayers for Vincent, 466 U. S. 789, 804 (1984). Discrimination against speech because of its message is presumed to be unconstitutional. See Turner Broadcasting System, Inc. v. FCC, 512 U. S. 622, 641-643 (1994). These rules informed our determination that the government offends the First Amendment when it imposes financial burdens on certain speakers based on the content of their expression. Simon & Schuster, Inc. v. Members of N. Y. State Crime Victims Bd., 502 U. S. 105,
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