To the mix of all the stories about Martin Luther King's fight against the injustice of racial segregation, I add the following:  Living in Richmond, Virginia ten years ago, I would frequent a soul-food restaurant, Mrs. Johnson's.  Inside the front dining room was a heavy wooden half-door.  It was not just decor--it was the backdoor where blacks used to get take-out, while the restaurant offered table service to whites only.  When Mrs. Johnson, who was black, bought the restaurant, she reinstalled it in the front.  I don't know whether the place has survived in another form, but this old description of its delights rings true.