Rahman was the general secretary of the East Pakistan Muslim League from 1952 to 1958. In 1962 he participated in the Pakistan National Assembly elections from Kushtia but lost. He joined the National Democratic Front led by Huseyn Shaheed Suhrawardy in 1962. In March 1964 he joined the Awami League and was subsequently elected vice-president of the Pakistan Awami League. In 1965 he was elected to the National Assembly from Kushtia and served as the deputy leader of the opposition from 1965 to 1969. He was one of the defense lawyers in the Agartala conspiracy case. At the outbreak of the Bangladesh Liberation War, Rahman supported the Pakistani state forces and denounced the Bengali nationalist struggle. He led the Pakistani delegation to the United Nations in November 1971, where he would emphatically deny that the Pakistan Army's Operation Searchlight had degenerated into genocide. In 1971, following the defeat of Pakistan in the Bangladesh Liberation War, Rahman was arrested under the collaborators act but was released in 1973 under a general amnesty by President Sheikh Mujib. In the post-war period, authorities estimated that over a million people had been killed in Bangladesh by Pakistani state forces and collaborating militias. Rahman would continue to lobby Muslim nations in the Middle East to decline diplomatic recognition to Bangladesh. After the assassination of Sheikh Mujib, he joined the revived Muslim League in Bangladesh in 1976. He then joined the newly founded Bangladesh Nationalist Party of President Ziaur Rahman in 1978 and was made the minister of labor and industry in Rahmans cabinet. When Ziaur Rahman had become the President of Bangladesh, he initially decided to appoint Mashiur Rahman Jadu Mia as prime minister, but after his sudden death on 12 March 1979, Shah Azizur Rahman was appointed to the office on 15 April 1979. It is believed that Ziaur Rahman preferred candidates such as Badruddoza Chowdhury or Saifur Rahman for the job. However, he also wanted the party's parliamentarians to choose their leader through a secret ballot, which the Shah Aziz managed to win so that Ziaur Rahman could not ignore him. As prime minister, Shah Azizur Rahman helped ratify the infamous Indemnity Act promulgated by Khondaker Mostaq Ahmed. Shah Azizur Rahman also helped Zia organize the Bangladesh Nationalist Party, which won the 1979 parliamentary elections. After the assassination of Ziaur Rahman in 1981, Shah Azizur Rahman continued to serve as prime minister. Although he was retained in that post by the new President Abdus Sattar, both Sattar and Rahman were overthrown in a military coup led by army chief Hossain Mohammad Ershad in 1982.
Death
Rahman died in Dhaka on 1 September 1989 at the age of 63.
