Orson Welles, who signed quite a few Popular Front era petitions, on the Hollywood 10, "They lied to save their swimming pools."
Left historians on Hollywood Left, "Class Struggle In Hollywood, " by Gerald Horne, ""The Inquisition in Hollywood: Politics in the Film Community, 1930-1960," by Larry Ceplair.
Right-wingnut on the same, "Hollywood Party: How Communism Seduced the American Film Industry in the 1930s and 1940s, " by Kenneth Lloyd Billingsley.