Jinnah's right hand); (also spelled Abdul Matin Chaudhary in English[a]) was a Pakistani Bengali trade unionist, journalist, politician, and a member of the Pakistan Constituent Assembly as a representative of East Bengal.

[1] Chaudhury was born on 13 February 1895 to a Bengali Muslim family in the mahalla of Fatehkhani in Bhadeswar pargana, Golapganj Upazila, Sylhet District, in the then Assam province.

In 1930, he argued that there should be legislation to set minimum wages and reduce working hours for railway workers and other tradespeople.

[2]: 29–32  In 1930–31, he was a member of the Drugs Enquiry Committee headed by Ram Nath Chopra which examined the need for imports, control and regulation for pharmaceuticals.

[5] Jinnah and the Simon Commission had recommended that constitutional reforms in India be discussed with the British government and three Round Table Conferences were held.

Chaudhury attended the first of these in London (November 1930 – January 1931) as Private Secretary to Sir Muhammad Akbar Hydari, who represented Hyderabad.

[6] In 1934, he attended the Melbourne Centenary in Australia as the sole representative of the Indian Branch of the Empire Parliamentary Association.

[11] The more charismatic and 'man of the masses' Abdul Hamid Khan Bhashani helped Chaudhary in agitating against the Line System with prominent All-India Muslim League leader Chaudhry Khaliquzzaman of the United Provinces, with Bhashani's invitation, visiting Assam annually between 1941 and 1946 to agitate against the Line System.

In 1946, Chaudhury was part of a sub-committee of the All-India Muslim League that drafted the Delhi Resolution, which called for the establishment of a unitary Pakistan comprising Northwest and Northeast India and was moved by Huseyn Shaheed Suhrawardy.

The referendum was held in July and the region subsequently became part of East Bengal after the majority voted for that outcome.