New York — The central question in 1947, as the House Un-American Activities Committee investigated alleged Communist influence in Hollywood, was: "Are you a member of the Communist Party?"Chaired by Republican Rep. John Parnell Thomas of New Jersey, the committee eventually led to a Hollywood blacklist, now the focus of a new exhibit at the New York Historical Society."The exhibit really tells the story of the Hollywood Ten," Louise Mirrer, president of the New York Historical Society, told CBS News, of a group of 10...