Known to old time radio fans everywhere as Sam Spade, Howard Duff was one of the biggest names of the radio era. Not only was he a skilled dramatic and comedic actor in front of the microphone, he also worked in the Armed Forces Radio Service and - through his job - helped preserve hundreds of the shows we know and love today. The blacklist and Red Scare paranoia dinged his career, but he emerged and continued to work in film and television through the 1980s. We'll hear him in "A Murderous Revision," an unaired recording of a show that was scrapped when he was branded a Communist (recording dated October 13, 1951) and "Eyewitness" (originally aired on CBS on December 16, 1956).