With the war on Islamic terrorism being portrayed as a righteous cause in “American Sniper,” the Clint Eastwood film breaking box office records, a book which documents the days when Hollywood was a mouthpiece for communist propaganda might seem out of date. But Allan H. Ryskind’s book, Hollywood Traitors, is a reminder that Hollywood can’t always be counted on to take America’s side in a war, even a World War when the United States faced dictators by the names of Adolf Hitler and Joseph Stalin.