Former Imperial Japanese Army staff officer Ryuzo Sejima joined Itoh in 1958 after spending 11 years in a Siberian prison. Four years later, he was promoted to director and became Itoh's head of corporate planning, implementing a military-style internal reporting system. He went on to serve as president and chairman of the company, having developed a powerful group of followers known as the "Sejima Machine." In 1970, Sejima and his younger protege Minoru Murofushi arranged a joint venture between General Motors and Isuzu, one of the first tie-ups between US and Japanese automakers. In 1972 Itoh became the first Japanese trading company allowed to do business in the People's Republic of China.