The was a short-lived

political party A political party is an organization that coordinates candidates to compete in a particular area's elections. It is common for the members of a party to hold similar ideas about politics, and parties may promote specific political ideology, ...

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

. It was founded on July 22, 1928 by the ''Rōnō'' faction (that had belonged to the

Labour-Farmer Party The was a political party in the Empire of Japan. It represented the left-wing sector of the legal proletarian movement at the time.Mackie, Vera C. Creating Socialist Women in Japan: Gender, Labour and Activism, 1900–1937'. Cambridge: Cambri ...

, before that party was banned in April 1928).

Suzuki Mosaburō is a Japanese multinational mobility manufacturer headquartered in Hamamatsu, Shizuoka. It manufactures automobiles, motorcycles, all-terrain vehicles (ATVs), outboard marine engines, wheelchairs and a variety of other small internal combu ...

became the general secretary of the party. Yamakawa and Sakai Toshihiko functioned as 'elder' advisors in the party. Other prominent founders of the party were Kuroda, Inamura Junzo and Okada.Beckmann, George M., and Genji Okubo.
The Japanese Communist Party 1922-1945
'. Stanford, Calif: Stanford University Press, 1969. p. 159 The Proletarian Masses Party claimed to have around 2,500 members. At the time of its foundation, the party declared its intention to struggle against leftwing sectarianism and rightwing disruptionism. Scalapino, Robert A.
The Japanese Communist Movement, 1920-1966
'. Berkeley: University of California Press, 1967. p. 35 The founders of the party were critical of the leadership of Oyama Ikuo in the remains of the Labour-Farmer Party, claiming that Oyama Ikuo was too hostile to a merger with the centrist

Japan Labour-Farmer Party The was a socialist political party in Japan between December 1926 and December 1928. During its existence, it occupied a centrist position in the divided socialist movement. Foundation The Japan Labour-Farmer Party was one of several proleta ...

. The party was in fierce competition with the Oyama Ikuo-led group over the loyalty of former Labour-Farmer Party activists and sympathizers. In October 1928 a women's organization linked to the Proletarian Masses Party, the Proletarian Women's Alliance, was founded. On December 20, 1928 the party merged with the Japan Labour-Farmer Party, the Japan Farmers Party and four regional political parties, to create the Japan Masses Party. The women's wing merged with the centrist National Women's League in January 1929, founding the Proletarian Women's League.Mackie, Vera C.
Creating Socialist Women in Japan: Gender, Labour and Activism, 1900-1937
'. Cambridge: Cambridge University Press, 2002. p. 134

References

{{Authority control Defunct political parties in Japan Political parties established in 1928 Political parties disestablished in 1928 Socialist parties in Japan Political parties in the Empire of Japan