On June 15th, 1920 in Duluth, Minnesota, three young, black circus workers, Elias Clayton, Elmer Jackson and Issac McGhie, were lynched. The Minnesota Historical Society has a great site devoted to the terrible event, Duluth Lynchings Online Resource. I'd especially like to point out the Oral Histories section, which has short interviews with African-Americans who lived through the event. In 2001 Minnesota Public Radio covered the story, inspired by a campaign to build a memorial to the three men, which was dedicated in October of 2003. The Clayton Jackson McGhie Memorial has a fine website which is well worth visiting.