Cite as: 531 U. S. 533 (2001)
Opinion of the Court
as governmental speech even under a generous understanding of the concept. In this vital respect this suit is distinguishable from Rust.
The private nature of the speech involved here, and the extent of LSC's regulation of private expression, are indicated further by the circumstance that the Government seeks to use an existing medium of expression and to control it, in a class of cases, in ways which distort its usual functioning. Where the government uses or attempts to regulate a particular medium, we have been informed by its accepted usage in determining whether a particular restriction on speech is necessary for the program's purposes and limitations. In FCC v. League of Women Voters of Cal., 468 U. S. 364 (1984), the Court was instructed by its understanding of the dynamics of the broadcast industry in holding that prohibitions against editorializing by public radio networks were an impermissible restriction, even though the Government enacted the restriction to control the use of public funds. The First Amendment forbade the Government from using the forum in an unconventional way to suppress speech inherent in the nature of the medium. See id., at 396-397. In Arkansas Ed. Television Comm'n v. Forbes, 523 U. S. 666, 676 (1998), the dynamics of the broadcasting system gave station programmers the right to use editorial judgment to exclude certain speech so that the broadcast message could be more effective. And in Rosenberger, the fact that student newspapers expressed many different points of view was an important foundation for the Court's decision to invalidate viewpoint-based restrictions. 515 U. S., at 836.
When the government creates a limited forum for speech, certain restrictions may be necessary to define the limits and purposes of the program. Perry Ed. Assn. v. Perry Local Educators' Assn., 460 U. S. 37 (1983); see also Lamb's Chapel v. Center Moriches Union Free School Dist., 508 U. S. 384 (1993). The same is true when the government establishes a subsidy for specified ends. Rust v. Sullivan, 500 U. S. 173
543
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