At the time, south-east Calcutta was viewed as the political nerve-centre of Calcutta, a city known for its vivid political life.[4] Calcutta South-East had a predominantly middle class character.[4] Whilst most of the assembly segments of Calcutta South East elected Indian National Congress legislators in the 1952 West Bengal Legislative Assembly election, the constituency was politically diverse.[4] With a Bharatiya Jan Sangh MP, there was also a significant communist presence (at least two communist legislators elected from the area).[4] The area of the constituency belonged to the areas that had elected Sarat Chandra Bose (Netaji Subash Chandra Bose's brother) against a Congress candidate.[4]
Mukherjee, a right-wing nationalist hardliner on the Kashmir conflict, had been detained in June 1953 whilst trying to enter Kashmir.[7] Whilst detained he suffered a heart attack and died.[7] A by-election was called in fill the vacancy created by Mukherjee's death.[8] Due to the dramatic circumstances of Mukherjee's death and the complexity of the Calcutta politics (whilst the constituency was seen as a Congress stronghold it had also elected a Bharatiya Jan Sangh MP as well as communist members of the West Bengal Legislative Assembly) the by-poll caught attention in national politics.[4][7]
The by-election was won by Gupta (CPI) with 58,211 votes (58.21%), Radhabinod Pal finished in second place with 36,319 votes (36.31%), J.P. Mitter (BJS) 5,431 (5.43%) and Bhupal Bose of the Forward Bloc (Marxist Group) got 5,415 votes (5.41%).[2][9]