What difficulties did Qian Xuesen encounter during his return to China in the movie Qian Xuesen?

1950 In July, Weinbaum, secretary of the Marxism-Leninism Group of the College, was arrested. The suspicion of the US Federal Bureau of Investigation fell on Qian Xuesen, who accused Qian Xuesen of being party member, the production party of the United States, and entering the country illegally. At this time, Qian Xuesen wanted to return to the motherland on the grounds of visiting relatives. When meeting with kimble, the US undersecretary of the Navy who was in charge of his research, the undersecretary of the Navy was shocked and said to his subordinates, "I would rather shoot this guy than let him go back to China. He can rank in the top five anywhere. "

Kimble immediately informed the Immigration Bureau that Mr. Qian, who knew nothing about this, was preparing to fly home with his family. Immigration suddenly told him not to leave the country. At the same time, the US Customs detained all Qian Xuesen's luggage, so Qian Xuesen was forced to return to California Institute of Technology. Since then, the FBI has sent people to monitor his family and all his actions.

1September 6, 950, Mr. Qian Xuesen was suddenly illegally detained by the FBI, and Qian Xuesen was tortured like a criminal in the detention center. According to Qian Xuesen's recollection, "I lost 30 pounds in the detention of 15 days. At night, the secret service wakes me up every 1 hour. I can't rest at all and fall into a state of extreme mental tension. "

After being detained, Qian Xuesen's mentor and friends raised $654.38 +0.5 million, and finally released him on bail. For the next five years, Qian Xuesen continued to be interrogated and harassed by the Immigration Bureau and the Federal Bureau of Investigation, and his freedom for five years was gone.

During these five years, Mr. Qian did not give up the belief of returning to China. One of the reasons why the American government prevented him from leaving the United States was that the rocket technology he studied was related to national defense. Knowing this, Qian Xuesen chose "engineering cybernetics" as his research direction to help remove the obstacles to returning to China. In fact, engineering cybernetics is closely related to national defense construction topics such as production automation, the development and application of electronic computers, but the American authorities did not realize this at that time.