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"Free speech" is a loaded term. In the US, you can't just say whatever you want without consequence, which is what lots of people seem to think "free speech" means.

Neither slander nor obscenity are protected by the First Amendment. Same goes for so-called "fighting words." Incitement of lawlessness is not protected. Incitement of suicide will likely be tested soon, but a lower court has ruled it is not protected.

And that's just a fraction of the types of speech not protected by the US Constitution.