Enrolled at Waseda University and became a leader of antimilitary training movement among the students. Leaving the university without graduating (1924)
He became a clerk at headquarters of Political Research Institute which was organized by Iso-o Abe and Mosaburo Suzuki. Served as secretary of Tokyo Publishing Workers Union and entered labor movement activities.
He became chief organizer of the National Labor Council Congress. During this period, he was arrested in connection with the so-called March 15 and April 16 cases. After being released from prison (1940), he joined the Federation of Labor (1945), increasing his influence gradually among the workers in Kanto District and became leader of the Federation of Left-Wingers.