I upvoted you, even though "never" is a big word, because though I think about history a lot, no counter-examples readily come to mind, sadly. Except me, I'm usually right. Just ask me. Right? :)
That's the thing about the age of enlightenment and founding of the USA era. You didn't have the internet or reddit or whatever to steal your attention. You could work through these sorts of things and when you do, you discover tons of wisdom. The founders of the USA provided no exceptions to free speech. Afterall, truly there should never be any. In fact, the freedom of religion is an even larger non-exception. Religion isn't defined, there are no exceptions.
Hundreds of years there were no exceptions and only recently have flawed humans thought up exceptions
I am not trying to be contentious, and can be wrong or stupid at times, but maybe there is an exception (or penalty) for some intentional lying from a position of trust. Like, a hired lifeguard buying insurance then saying "there are no dangers", when he knows the beach is closed due to an infestation of sharks, pollution, and whirlpools, which he has also just seen. Or maybe that is not called mere speech. Still....