An idea for a Constituent Assembly was proposed in 1934 by M.N. Roy, a pioneer of the Communist movement in India and an advocate of radical democracy. It became an official demand of the Indian National Congress in 1935, C. Rajagopalachari voiced the demand for a Constituent Assembly on 15 November 1939 based on adult franchise, and was accepted by the British in August 1940. On 8 August 1940, a statement was made by Viceroy Lord Linlithgow about the expansion of the Governor - General 's Executive Council and the establishment of a War Advisory Council. This offer, known as the August Offer, included giving full weight to minority opinions and allowing Indians to draft their own constitution. Under the Cabinet Mission Plan of 1946, elections were held for the first time for the Constituent Assembly. The Constitution of India was drafted by the Constituent Assembly, and it was implemented under the Cabinet Mission Plan on 16 May 1946. The members of the Constituent Assembly were elected by the provincial assemblies by a single, transferable - vote system of proportional representation. The total membership of the Constituent Assembly was 389: 292 were representatives of the states, 93 represented the princely states and four were from the chief commissioner provinces of Delhi, Ajmer - Merwara, Coorg (Near Madikeri) and British Baluchistan.
who gave the idea of constituent assembly for india in 1934
M.N. Roy