Aung San tare da wasu Thakins sun kafa Jam'iyyar Kwaminis ta Burma (CPB) a watan Agusta 1939. Aung San ya kuma kafa Jam'iyyar Juyin Juya Halin Jama'a (PRP), wanda aka sake masa suna da Jam'iyyar Socialist bayan yakin duniya na biyu. Ya kuma taimaka wajen kafa kungiyar 'yanci ta hanyar kulla kawance da Dobama Asiayone, ABSU, limaman da ke aiki da siyasa da kuma Ba Maw Maw's Poor Man's Party. Bayan Asiama Dobayone ya yi kira ga tayar da hankali na kasa, an ba da umurnin kama shugabannin kungiyar, ciki har da Aung San San, wanda ya tsere wa Aung San.
Kasancewar Burma a cikin yakin