noun
proletarian party
Historical political term for a party representing the working class, especially in pre-war and early post-war Japan.
戦前の日本にはいくつかの無産政党が存在した。
Several proletarian parties existed in pre-war Japan.
労働党 is a more general term for a labor party, while 無産政党 specifically refers to historical proletarian parties in Japan.
Compound of 無産 (musan, 'propertyless; proletarian') and 政党 (seitō, 'political party'). The term reflects early 20th-century socialist and labor movement terminology.