I found this thanks to a link from my pal Aaron Barnhart. It's an article about the blacklisting that went on in the fifties, more specifically at CBS. What's chilling is that it incudes a reproduction of an actual "do not hire" list with names like Zero Mostel, Jack Guilford [sic], Leonard Bernstein, Howard da Silva, Gene Kelly, Burt Lancaster, Garson Kanin, Ruth Gordon and Philip Loeb. Philip Loeb is the actor who committed suicide because of what the blacklist did to his career.