[1] The ancestral home of his family was located at Bakri village, Bagherpara Upazila, Jessore District.
[1][4][5] Sen became a leader of the East Pakistan Communist Party (Marxist-Leninist).
[2] The EPCP(M-L) led by Sen and Nazrul Islam was one of the groups participating in the Coordination Committee of the Bangladesh Liberation Struggle set up in Calcutta.
[6][8] The Sen-Nazrul Islam faction set up the Bangladesh Communist Solidarity Committee.
[9] Sen spent a total of 19 years in prison, linked to his political activism.