[2] In 1920, Amin began at the University of Calcutta; he gained an LLB in Law and Justice in 1924, and passed the Bar exam the same year.

[citation needed] Amin became a trusted lieutenant of Muhammad Ali Jinnah in East Bengal, fighting for the rights of Bengali Muslims in British India.

[6] Amin failed to counter the Communist Party's influence in the region, which widely took the credit for turning the language movement in 1952 into a large unified mass protest.

[6] During Amin's term as Chief Minister, Governor General Nazimuddin (also from East Bengal but bilingual) reiterated the federal government's position that while Bengali was the language of virtually all East Pakistanis as well as the majority of Pakistanis as a whole, it was not to be considered a national language on a par with Urdu.

[7] In response, the Bengali Language Movement developed, and the ruling Muslim League lost popularity in East Pakistan.

[7] Amin on the other hand, held Communist Party responsible for this failure, accusing them of provoking the language movement.

[8] In early 1952, students protested against Prime Minister Nazimuddin's declaration in the provincial capital Dacca (now Dhaka) that Urdu would be the sole national language.

[9] Prime Minister Bogra (also a Bengali) visited East Bengal in early 1954 in an attempt to rally support for the League, but it was too late.

In the 1954 provisional elections, the Muslim League was defeated by the United Front, an alliance between the Awami League (led by Huseyn Shaheed Suhrawardy), the Krishak Sramik Party (chaired by A. K. Fazlul Huq), the Nizam Islam Party (headed by Maulana Athar Ali), and the Ganatantri Dal (led by Haji Mohammad Danesh and Mahmud Ali), eventually becoming more and more influential in Pakistani politics.

[10] It was in this turnover that Amin lost his assembly seat to a veteran student leader of East Pakistan, Khaleque Nawaz Khan, who had also been active in the Language Movement.

During this time, the Pakistani authorities made reforms, including granting official status to the Bengali language in 1956 alongside Urdu.

[13] But after Army Commander General Mohammad Ayub Khan imposed martial law following the successful October 1958 Pakistani coup d'état against the government of President Iskander Mirza, Amin's political career was halted as Ayub Khan disbanded all political parties in the country.

[14][citation needed] Amin in June 1969 merged his National Democratic Front with a dissident group of the Awami League led by Nawabzada Nasrullah Khan, the Nizam-e-Islam Party, and Air Marshal (Retd.)

Amin stayed in West Pakistan, while his home region achieved independence as the People's Republic of Bangladesh.

He died of cardiac arrest aged 81 in Rawalpindi on 2 October 1974 and was given a public state funeral by Prime Minister Zulfikar Ali Bhutto.

He proved himself to be a crusader of (Pakistan's) solidarity and earned for himself the highest pedestal by dint of his efforts, intelligence, and his struggle...Amin had written an unpublished autobiography.