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HUAC stands for the House of Un-American Activities Committee. It was formed in 1938 to investigate Facist and Communist activities. Martin Dies Jr. had started the HUAC in fact.
https://www.history.com/topics/cold-war/huac

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The Hollywood ten was a group of ten motion-picture producers,  directors and screenwriters. But they had refused to answer questions regarding to possible communism. Because of this, they went to jail and were banned from all studios in Hollywood.
https://www.britannica.com/topic/Hollywood-Ten

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In 1948, Alger Hiss, a government official, had been accused of being a Soviet Spy. He had been accused of perjury later on because of this and found himself in court. Once they had found out he was in fact a spy, he had served four years in prison.
https://www.history.com/this-day-in-history/alger-hiss-convicted-of-perjury

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These two had been key spies for the Soviets that had been working for the Federal Government. They had passed over the secrets of the nuclear bombs to the Soviets. Once the United States had found out about this, they had executed them.
https://www.history.com/this-day-in-history/julius-and-ethel-rosenberg-executed

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Joseph McCarthy had made a world-wide speech that explained how he knew all the soviets that were working in the Shipping Department. Because of this, the government had done a lot of research on this just to find out it's not true. Due to this, over 2,000 government officials lost their job.
https://www.history.com/topics/cold-war/joseph-mccarthy

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This bomb gave the United States a large advantage in the nuclear war. Many Soviets had been trying to figure out the secret of this bomb. So as a result, they sent out spies to find the secrets behind it.
http://www.atomicarchive.com/History/coldwar/page04.shtml

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on May 1960, the United states had sent over a spy plane and immediately it had been shot down by the soviets. Because of this, President Dwight D. Eisenhower had admitted to the Soviets that they had been sending spy planes for years. This had caused charges on him and was soon sent to prison for ten years.
https://www.history.com/topics/cold-war/u2-spy-incident