Caltech professor Qian Xuesen endures five years of McCarthy-era investigations before returning to China to become the father of the country's space program.Caltech professor Qian Xuesen endures five years of McCarthy-era investigations before returning to China to become the father of the country's space program.Caltech professor Qian Xuesen endures five years of McCarthy-era investigations before returning to China to become the father of the country's space program.