If there is one movie we all share, it is The Wizard of Oz, but now it is time to pay attention to the woman behind the cackle. The story of Margaret Hamilton, whose Wicked Witch of the West has left an indelible mark on us all, is told in a delightful 85 minutes. Support American Theatre: a just and thriving theatre ecology begins with information for all. Please join us in this mission by making a donation to our publisher, Theatre Communications Group. When…