Public Forum Doctrine

The Public Forum Doctrine classifies government property into categories that determine the level of First Amendment protection for speech conducted on that property. The doctrine recognizes three categories of forums, each with distinct rules governing the government's ability to restrict speech.

Traditional public forums are places that have historically been devoted to assembly and debate, such as streets, sidewalks, and parks. In traditional public forums, content-based restrictions are subject to strict scrutiny, and content-neutral restrictions must satisfy the time, place, and manner test: they must be narrowly tailored to serve a significant government interest and leave open ample alternative channels of communication. Designated (or limited) public forums are government properties that the government has intentionally opened for expressive activity by certain groups or for certain subjects. While open, these forums receive the same protections as traditional public forums. However, the government may close a designated public forum entirely, provided it does so on a viewpoint-neutral basis.

Nonpublic forums are government properties that are not traditionally open for public expression, such as military bases, jail grounds, government office buildings, and mailboxes. In nonpublic forums, the government may restrict speech so long as the restriction is reasonable and viewpoint-neutral. The government need not demonstrate a compelling or significant interest, but it cannot suppress speech merely because it disagrees with the speaker's viewpoint. This tripartite framework was consolidated in Perry Education Association v. Perry Local Educators' Association (1983) and remains the governing doctrine.