Freedom of speech does not exist in the abstract. On the contrary, the right to speak can flourish only if it is allowed to operate in an effective forum -- whether it be a public park or a radio frequency. For in the absence of an effective means of communications, the right to speak would ring hollow indeed. And, in recognition of these principles, we have consistently held that the First Amendment embodies, not only the abstract right to be free from censorship, but also the right of the individual to utilize an appropriate and effective medium for the expression of his views.
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