Let me give you an example:

"A" has coercive control over another individual, "B," someone they've abused so much that B can't or won't resist A's authority or demands.

A puts B in a room with another person, "C," who's been captured by A. Speaking out loud, A orders B to kill C. B obliges.

This is not "freedom of speech." This example is the commission of several crimes that happen to use one's voice. Slander is similar in that someone "says" something that is demonstrably untrue for the purpose of falsely damaging another person. The use of speech here is just the arbitrary vehicle for the crime or tort, but the crime or tort could be committed in many different ways.

Freedom of speech does not encompass any and every literal use of the voice. There are many, many clear examples where using one's voice is incidental in hurting or damaging another person, whether figuratively or literally.

So we're clear, freedom of speech is about the uninhibited expression of truth or opinion.