In 1928, the Japanese Proletarian Arts Federation (全日本無産者芸術連盟, Nippona Artista Proleta Federacio, known as NAPF) was founded, bringing together the Japan Proletarian Artists Union (日本プロレタリア芸術連盟), the Labor-Farmers Artists Union (労農芸術家連盟), and the Vanguard Artists Union (前衛芸術家同盟).
In 1931, the 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), incorporating other cultural organizations, such as musicians and filmmakers.