I’m stretching the definition a little in that case, but I don’t think it’s an untenable stretch. Speech is the act of expressing a thought. Art expresses thoughts as well. A movie, or a painting, or a book also expresses thoughts, which indicates a kind of kinship with speech.

And yet there are movies and books and paintings we probably shouldn’t share with certain people, certain thoughts which should not be expressed to the young. Americans are mostly in agreement with this curtailment of freedom of expression/speech.

As I said, I admit that I’m stretching the definition of speech a little with that example, but I think you’ll agree that the boundary between speech and action can be somewhat blurry at times.