Following this, he worked as a journalist at the Tokyo Nichinichi Shimbun but left before long to aid in founding the Renmeikai and Shinjinkai in December 1918 with Yoshino Sakuzō.

He participated in several labor disputes and, joining the Yūaikai in 1919, became the union's political section chief in 1925.

In 1926, however, the leadership of the union expelled Asō and several others over secret plans to create a centrist proletarian party.

Finally, in 1936, Asō won a seat in the House of Representatives for District 5 of Tokyo.

In 1938, Asō, Kamei, and Akiyama Teisuke worked together to draft plans for a new reformist, totalitarian political party to be led by themselves and Fumimaro Konoe.