Who among the following was not associated with the Lahore conspiracy case?

The Lahore Conspiracy Case (specifically the Second Lahore Conspiracy Case) was initiated following the murder of British police officer John Saunders in 1928. Bhagat Singh, Rajguru, and Sukhdev were the primary accused in this case [2]. They were tried by a Special Tribunal and subsequently executed on March 23, 1931, in Lahore Central Jail [5][t1]. Other associates like Jatindra Nath Das were also part of this trial [1]. In contrast, Surya Sen, popularly known as 'Masterda', was a revolutionary leader based in Bengal. He was the mastermind behind the Chittagong Armoury Raid in April 1930 [t7]. Surya Sen was never associated with the Lahore Conspiracy Case; his activities were centered in the Chittagong region of undivided Bengal, leading to his own separate trial and execution in 1934. Therefore, Surya Sen is the correct answer as the individual not associated with the Lahore case.

Sources

1. [1] History , class XII (Tamilnadu state board 2024 ed.) > Chapter 5: Period of Radicalism in Anti-imperialist Struggles > Lahore Conspiracy Case > p. 64
2. [2] Rajiv Ahir. A Brief History of Modern India (2019 ed.). SPECTRUM. > Chapter 17: Emergence of Swarajists, Socialist Ideas, Revolutionary Activities and Other New Forces > Action against the Revolutionaries > p. 351
3. [4] Modern India ,Bipin Chandra, History class XII (NCERT 1982 ed.)[Old NCERT] > Chapter 15: Struggle for Swaraj > THE SECOND NON-COOPERATION MOVEMENT > p. 282
4. [5] https://www.thehindu.com/opinion/op-ed/rare-documents-on-bhagat-singhs-trial-and-life-in-jail/article2356959.ece