We recently told you about an archive in Massachusetts dedicated to the assassination of Robert F. Kennedy and the authors who relied on it. Their books are being published to mark the 50th anniversary of Kennedy's death, which will be marked early next month. A labor activist in Los Angeles who was wounded during the assassination remains a skeptic that Sirhan Sirhan was the sole assassin. Click above to hear WBGO's Jon Kalish's feature on Paul Schrade.