Mashiur Rahman Jadu Mia was an elected member of National Council of Pakistan in 1962 and led the council as deputy leader of the opposition. He was arrested in 1963 for his involvement in the anti-government movement. Before the liberation war, in 1971, Jadu Miah formally declared Bangladesh's independence and called for forming an all-party government at a public gathering at Paltan Maidan on 23 March. He became Abdul Hamid Khan Bhashani's deputy leader in the National Awami Party in the same period.