労働農民党
There would be several different attempts by leftists to recreate a party representing the Labour-Farmer Party legacy. Immediately after the disbanding of the Labour-Farmer Party, the Communist Party instructed its cadres to rebuild the party. The goal to achieve unification with the Japan Labour-Farmer Party was retained. A reorganization committee was formed (named the 'Committee for the Rebuilding of the Labour-Farmer Party and Preparation for New Party'). Oyama Ikou served as the chairman of the committee and Hososako as the general secretary. The committee was quickly banned by the government, but continued to function illegally. In July 1928 the "Rōnō" faction broke away from the committee and founded the Proletarian Masses Party. In December 1928 the Proletarian Masses Party merged with the Japan Labour-Farmer Party, forming the Japan Masses Party. In the same month the Oyama Ikuo group held a refoundation conference of the Labour-Farmer Party, but the party was again banned swiftly. In January 1929 Mizutani Chozaburo denounced his former comraders of the Labour-Farmer Party as 'too communistic', thus ending the continuity of the Labour-Farmer Party parliamentary faction. In November 1929 Oyama Ikuo and his followers founded the New Labour-Farmer Party. After having formed this party a final break between Oyama Ikuo and the communists occurred, and the communists began labelling him as a 'traitor'.