Than Tun worked as a school teacher after qualifying from the Teachers' Training School,
Rangoon, and was influenced by Marxist writings. He joined in 1936 the nationalist
Dobama Asiayone ("Our Burma" Association) and helped forge an alliance with Dr
Ba Maw's
Poor Man's Party to form the
Freedom Bloc. He co-founded the
Nagani (Red Dragon) Book Club with
Thakin Nu in 1937, which for the first time widely circulated Burmese-language translations of the Marxist classics. He was imprisoned by the British in 1940 along with
Thakin Nu,
Thakin Soe, Dr.
Ba Maw, and
Kyaw Nyein. When
Ba Maw's pro-Japanese government was established in 1942, Than Tun served as Minister of Land and Agriculture, and he met and married Khin Gyi, sister of
Aung San Suu Kyi's mother
Khin Kyi. Aung San married Khin Kyi about the same time shortly after he became Minister of War; the BIA was renamed the Burma Defence Army (BDA). Than Tun could pass on Japanese intelligence to Thakin Soe who had gone underground in the Delta region in order to organise resistance against the Japanese Occupation. Thakins Thein Pe and Tin Shwe were sent to
India to make contact with the British colonial government in exile at
Simla. At the end of
World War II, after the Japanese had been defeated and the British had returned, Than Tun became general secretary of the
Anti-Fascist People's Freedom League (AFPFL) formed by the CPB, the People's Revolutionary Party (PRP, later renamed the Socialist Party) and the BDA, now renamed the Burma National Army (BNA) and led by his brother-in-law
Aung San. Than Tun, unlike Aung San, was not among the six men who founded the CPB on 15 August 1939; Aung San was its first secretary general, with Thakin Soe in charge of mass organisation. ==Civil war==