Who pulled the curtain back to show Oz was a fake in movie Wizard of OZ?

The curtain back to reveal the Wizard of Oz as a fake was pulled by Dorothy Gale.

It's a pivotal moment in the film! Dorothy, with the help of her friends, realizes the Wizard is just a man behind a curtain, manipulating levers and creating illusions. She calls him out, and the Wizard's power and control crumble.