NAPF became the Union of Japanese Proletarian Cultural Organizations (日本プロレタリア文化連盟, Federacio de Proletaj Kultur Organizoj Japanaj, also known as KOPF)...

the secretary general of the Japan Proletarian Cultural Federation (日本プロレタリア文化連盟, Nihon puroretaria bunka renmei). He worked with other left-wing groups...