There is no such thing as an unalienable right or as a human right.
Rights are simply the expression of the interests of certain classes at a certain point in time.
That said, I struggle to find "free speech" a compelling inalienable right when it's what has directly led to the disaster befalling the Americas in this very moment. Especially since the American conception of "free speech" isn't just to be able to express oneself, but to actually have one's words be accepted no matter what.