This excellent film is an entirely factual account of the extraordinary extent of Communist espionage in North America during World War Two. It depicts the true story of a Soviet code clerk at the USSR's embassy in Canada who, through his work, becomes aware of a massive Communist spy apparatus that has penetrated the highest levels of the American and Canadian governments. Recognizing both how life is free in the West and horrifyingly oppressive under Communism, he and his family defect and bring shocking documentary evidence of Communist spying to the Canadian and U.S. governments. The movie also points out the irony that being sent back to the Soviet Union was viewed as a death sentence. All of this is true. Hollywood has created countless fictional tales of McCarthyite "witchhunts" in the recent era, yet the authentic history depicted by "Iron Curtain" remains almost unknown. How tragic. The United States in 1995 released the ultra-secret VENONA decryptions of less than two percent of Soviet code traffic between NKVD stations in the United States and "Moscow Center" - code traffic that had been cracked by the U.S. Army Signal Corp. and its successor, the National Security Agency, without the knowledge even of Presidents Roosevelt and Truman. Hundreds of high-level employees in the OSS, the White House, the Departments of State, War, and Treasury, the atomic-bomb Manhattan Project, and many other agencies - all were Communist spies. The penetration went up to the assistant secretary level in the cabinet and may have included members of Roosevelt's immediate staff. It certainly included top-security Manhattan Project scientists who gave the Soviets all they needed to make atomic weapons that would ultimately be aimed at America. These shocking facts are ignored by the contemporary media, Hollywood, and academia and are, quite literally, almost completely unknown today. Watch this movie and look up VENONA. Their revelations about Communist espionage are genuine and breathtaking.