It has been 50 years since the Freedom Riders boarded buses, trains and planes bound for the Deep South to challenge that region's outdated Jim Crow laws. The Freedom Rides were intended to highlight the South's non-compliance with a U.S. Supreme Court decision that prohibited segregation in all interstate public transportation facilities. This week, many of the estimated 350 Freedom Riders who put their lives on the line are making their way to a reunion in Chicago - and to join in the taping of a show about the Freedom Rides on the Oprah Winfrey Show, set to air May …