Labour-Farmer Party
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. 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 party was in fierce competition with the Oyama Ikuo-led group over the loyalty of former Labour-Farmer Party activists and sympathizers.