Explanation: In the Kanpur Conspiracy case, Muzaffar Ahmed, Shaukat Usmani, Nalini Gupta and S. A. Dange were sent to jail, for four years of rigorous imprisonment.

• Thirteen persons were originally accused in the Kanpur case: (1) M.N. Roy, (2) Muzaffar Ahmad, (3) Shaukat Usmani, (4) Ghulam Hussain, (5) S.A. Dange, (6) M. Singaravelu, (7) R.L. Sharma, (8) Nalini Gupta, (9) Shamuddin Hassan, (10) M.R.S Velayudhun, (11) Doctor Manilal, (12) Sampurnananda, (13) Satyabhakta.
• Eight persons were charge-sheeted: M.N. Roy, Muzaffar Ahmad, S.A. Dange, Nalini Gupta, Ghulam Hussain, Singaravelu, Shaukat Usmani, and R.L. Sharma.
• Ghulam Hussain turned an approver. M.N. Roy and R.L. Sharma were charged in absentia as they were in Germany and Pondicherry (a French Territory) respectively.
• Singaravelu was released on bail due to his ill health. Finally, the list got reduced to four.

Source: Tamil Nadu NCERT