Contrary to conventional wisdom, some of the most contentious disputes over international labor standards and worker rights occurred not between Western nations and the “rest” but within single nations. To explore the deep fissures in Japanese society over the rights of women and workers, I offer the first scholarly account of Japan's only woman representative to the ILO's inaugural 1919 Washington conference, elite social feminist Tanaka Taka, grandniece of renowned Japanese capitalist Shibusawa Eiichi. I recount her efforts in Japan and in Washington to secure free speech and economic rights for Japan's workers, men and women, and detail the hostilities she encountered from employers and organized labor. In addition, I reconstruct the parallel tale of factory supervisor Masumoto Uhei whose appointment as Japan's labor delegate led to widespread labor protests and a power struggle between trade unions and the state in Japan. The debate over who would speak for Japan's workers at the ILO and whether Japan would accept the labor standards being proposed by Western nations captured worldwide attention. It changed ideas in the East and the West about what Japan's workers deserved and desired and had lasting consequences for global politics and social policy.