He started his political career in 1929 when he entered the
Bengal Legislative Council as an
Indian National Congress (INC) candidate representing Calcutta University. However, he resigned the next year when the INC decided to boycott the legislature. Subsequently, he contested the
election as an
independent candidate and was elected in the same year. In
1937, he was elected as an independent candidate in the elections which brought the
Krishak Praja Party to power. He served as the Finance Minister of Bengal Province in 1941–42 under
A.K. Fazlul Haq's Progressive Coalition government which was formed on 12 December 1941 after the resignations of the Congress government. During his tenure, his statements against the government were censored and his movements were restricted. He was also prevented from visiting the
Midnapore district in 1942 when severe floods caused a heavy loss of life and property. He resigned on 20 November 1942 accusing the British government of trying to hold on to India at any cost and criticised its repressive policies against the
Quit India Movement. After resigning, he mobilised to support and organised relief with the help of the
Mahabodhi Society,
Ramakrishna Mission and Marwari Relief Society. In
1946, he was again elected as an independent candidate from Calcutta University. He was elected as a member of the
Constituent Assembly of India in the same year.
Hindu Mahasabha and Bengali Hindu Homeland Movement Mukherjee joined the
Hindu Mahasabha in Bengal in 1939 and became its
acting president that same year. He was appointed as the working president of the organisation in 1940. In February 1941, Mukherjee told a
Hindu rally that if Muslims wanted to live in Pakistan they should "pack their bag and baggage and leave India ... [to] wherever they like". Yet, the Hindu Mahasabha also formed provincial coalition governments with the
All-India Muslim League in
Sindh and the
North-West Frontier Province while Mukherjee was its leader. He was elected as the President of Akhil Bharatiya Hindu Mahasabha in 1943. He remained in this position till 1946, with Laxman Bhopatkar becoming the new president in the same year. Mukherjee demanded the partition of Bengal in 1946 to prevent the inclusion of its Hindu-majority areas in a Muslim-dominated
East Pakistan. A meeting held by the Mahasabha on 15 April 1947 in
Tarakeswar authorised him to take steps for ensuring the partition of Bengal. In May 1947, he wrote a letter to
Lord Mountbatten telling him that Bengal must be partitioned even if India was not. He also opposed a failed bid for a
united but independent Bengal made in 1947 by
Sarat Bose, the brother of
Subhas Chandra Bose, and
Huseyn Shaheed Suhrawardy, a
Bengali Muslim politician. His views were strongly affected by the
Noakhali genocide in
East Bengal, where mobs belonging to the Muslim League massacred Hindus. It was Mukherjee who launched the
Bengali Hindu Homeland Movement. It refers to the movement of the Bengali Hindu people for the Partition of Bengal in 1947 to create a homeland aka West Bengal for themselves within the Indian Union, in the wake of the Muslim League's proposal and campaign to include the entire province of Bengal within Pakistan, which was to be a homeland for the Muslims of British India.
Opposition to Quit India Movement Following the Hindu Mahasabha's official decision to boycott the
Quit India movement and the
Rashtriya Swayamsevak Sangh's decision of non-participation in the movement. Mukherjee wrote a letter to
Sir John Herbert,
Governor of Bengal as to how they should respond to "Quit India" movement. In this letter, dated 26 July 1942 he wrote: Let me now refer to the situation that may be created in the province as a result of any widespread movement launched by the Congress. Anybody, who during the war, plans to stir up mass feeling, resulting in internal disturbances or insecurity, must be resisted by any Government that may function for the time being. Mukherjee in this letter reiterated that the Fazlul Haq-led Bengal Government, along with its alliance partner Hindu Mahasabha would make every possible effort to defeat the
Quit India Movement in the province of Bengal and made a concrete proposal in regard to this: The question is how to combat this movement (Quit India) in Bengal? The administration of the province should be carried on in such a manner that despite the best efforts of the Congress, this movement will fail to take root in the province. It should be possible for us, especially responsible Ministers, to be able to tell the public that the freedom for which the Congress has started the movement, already belongs to the representatives of the people. In some spheres, it might be limited during an emergency. Indians have to trust the British, not for the sake of Britain, not for any advantage that the British might gain, but for the maintenance of the defense and freedom of the province itself. You, as Governor, will function as the constitutional head of the province and will be guided entirely on the advice of your Minister. The Indian historian
R.C. Majumdar noted this fact and stated: Shyam Prasad ended the letter with a discussion of the mass movement organised by Congress. He expressed the apprehension that the movement would create internal disorder and endanger internal security during the war by exciting popular feeling and he opined that any government in power has to suppress it, but that according to him could not be done only by persecution... In that letter, he mentioned item-wise the steps to be taken for dealing with the situation... During Mukherjee's resignation speech, however, he characterised the policies of the British government towards the movement as "repressive". ==Political career after independence==