And those scientists were beaten to death or killed by Mao!

     And those leading scientists who worked on the "Two Bombs, One Satellite" program, Yao Tongbin was beaten to death, Zhao Jiuzhang committed suicide, and Guo Yonghuai was killed in a plane crash. More than 4,000 staff members were persecuted. More than 310 of them were permanently disabled, over 40 people committed suicide, and five were executed. Many researchers with overseas education background (especially from the United States and the United Kingdom) were regarded as "spies".