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So free speech is not a constitutionnal right if I follow your argument? You sound quite scary right now... (and I am not even concerned, not american)
And anyway the first amendment is about the congress. It doesn't limit the capacity of the executive branch to do ideological purges as the McArthysm period showed. Although it did got limited by the courts - from the reading of case law it had to do more with the fifth amendment and not first.