Thirty-one years ago , there was a slave auction at Colonial Williamsburg. On October 10, 1994, two Black men and two Black women were led up the steps and onto the porch of an 18th-century tavern. They were made to stand in front of thousands of people as their bodies were examined by prospective buyers. An auctioneer informed the crowd that only gentlemen with appropriate letters of credit would be permitted to bid. Some in the crowd looked on in astonishment; some turned away and began to