Resistance and change often begin in art

We live in capitalism, its power seems inescapable — but then, so did the divine right of kings. Any human power can be resisted and changed by human beings. Resistance and change often begin in art. Very often in our art, the art of words.

– Ursula K. Le Guin

I'm sure it's true, but would be good to find some examples.

See also Stories don't just describe our world, they cast it for the general notion of art and creativity being able to change the world.