Manzur was elected to Parliament in 1973, the first parliament of Bangladesh, from
Bakerganj-8 as a candidate of Bangladesh Awami League. He served in the Fourth Sheikh Mujib cabinet as the State Minister of Communication. He was dismissed from the post by Sheikh Mujibur Rahman on 21 July 1975. According to the sources of the United States Embassy in Dhaka, he was removed due to his rivalry with
Abdur Rab Serniabat, the Minister of Flood Control and Water Development and brother-in-law of President Sheikh Mujibur Rahman. The two had a rivalry centering on
Barisal District, their home district. He joined the Moshtaque Ahmad government after the assassination of Sheikh Mujibur Rahman as State Minister for Railways and Communication. Manzur was arrested in 1999 along with
KM Obaidur Rahman, and
Shah Moazzem Hossain in the
jail killing case in 1999 by the Bangladesh Awami League government. Their arrests were protested by 109 Members of Parliament of Bangladesh Nationalist Party. The jail killing refers to the killing of four national leaders in jail following the
15 August 1975 Bangladesh coup d'état and
Assassination of Sheikh Mujibur Rahman. The court cleared them of the charges in 2004 when Bangladesh Nationalist Party was in power. == Death ==