In 1927, the Taiwan Cultural Association split because of an internal ideological division between rightists and leftists. Chiang went on to help found the Taiwanese People's Party on a platform of unity. The Taiwan People's Party was the first legal party to be founded in Taiwan. Chiang was also involved with the and the . He came under criticism from rightists in the government. When , and others prepared for the formation of the , Chiang expelled them. The Taiwan People's Party contacted the League of Nations several times to protest Japanese issuance of special permits for opium sale as well as the Wushe Incident.