[1] Das contested the first West Bengal Legislative Assembly election in independent India, held in 1952, as a KMPP candidate, winning the Contai North seat.
[5][6][7][8] On 9 May 1969 Das, leading a dissident faction of the Praja Socialist Party, was sworn in as Animal Husbandry & Veterinary Minister in the second United Front government of West Bengal.
[12] Das retained the Contai South seat in the 1972 West Bengal Legislative Assembly election, contesting on an independent ticket.
[13] On 11 June 1972 the rebel PSP led by Das and Arun Mitra merged into the Indian National Congress to "pursue the socialist path shown by Indira Gandhi".
[2] Das lost the Contai South seat in the 1977 West Bengal Legislative Assembly election, defeated by Satya Brata Maiti of the Janata Party.