How McCarthy-era paranoia handed China its rocket program

Qian Xuesen helped found Caltech’s Jet Propulsion Laboratory and was among the most consequential aerospace engineers in mid-century America, with deep access to U.S. ballistic missile and jet propulsion research. When the Red Scare swept Washington in the early 1950s, his Chinese citizenship and tenuous Communist Party associations made him a target. After years of house arrest and a stalled career, the Eisenhower administration traded him back to China in 1955 in exchange for American POWs from the Korean War.

The transfer proved to be one of the costliest counterintelligence own-goals of the Cold War. Qian became the architect of China’s missile and space programs, directing the development of the Dongfeng ballistic missile series and laying the foundations for what would eventually become the PLA Rocket Force and China’s manned spaceflight capability. The technical lineage from his Caltech work to Beijing’s nuclear delivery systems is direct.

The piece frames Qian’s deportation as a cautionary case study in how loyalty-based security screening, when driven by ethnicity and political panic rather than evidence, can produce strategic damage that outlasts the regime that caused it. Seventy years on, the capabilities he built still shape the Pacific military balance.