Rikken Minseitō
In the months following the war, the Imperial Rule Assistance Association caucus broke up and three major political parties emerged in the Diet, loosely based around the major parties that stood in the 1937 election prior to the war. The Liberal Party was mainly composed of former Rikken Seiyūkai members, while the Progressive Party was mainly composed of former Rikken Minseitō members and the Socialist Party was mainly composed of former Shakai Taishūtō members.