Under our Constitution, free speech is not a right that is given only to be so circumscribed that it exists in principle but not in fact. Freedom of expression would not truly exist if the right could be exercised only in an area that a benevolent government has provided as a safe haven for crackpots. The Constitution says that Congress (and the States) may not abridge the right to free speech. This provision means what it says. We properly read it to permit reasonable regulation of speech-connected activities in carefully restricted circumstances. But we do not confine the permissible exercise of First Amendment rights to a telephone booth or the four corners of a pamphlet, or to supervised and ordained discussion in a school classroom.
