Ping.
Bernstein was a hardcore Communist Party member by his own admission and he was a nasty bastard too. There is a chapter/interview with him in “Tender Comrades: A Backstory of the Hollywood Blacklist” by Patrick McGilligan and Paul Buhle, Trotskyite historian, St. Martin’s Press, 1997.
Though the book is written by reds in a friendly approach to the Reds/usually unapologetic ex reds, the authors did get some quotes and history that showed the CPers were hardcore, pro-Soviet ideological enemies of capitalism and a non-Communist America.
Other sources on the “blacklist” and Hollywood include:
Alan Ryskind - “Hollywood Reds”, about his father and others fights against the Commies in the Screen Writers Guild.
Victor Navasky - Coverup for the Communist Party’s attempts to takeover Hollywood, “Naming Names”.
Robert Vaughn (the actor) - “Only Victims”, a liberal’s criticism of the investigations of Communism in Hollywood and the black list. Great bibliography/source notes which are worth the price of the book alone. I talked to him about the book and came to view him as a liberal, not a communist sympathizer. Worth having along with the others.
Also, see the House Committee on Un-American Activities series of hearings on communism and Hollywood in their hearings from about 1947-57. Lots of interesting information in them as well as grandstanding by all sides.