Political history of Sri Aurobindo
Anushilan Samiti was founded as an attempt to organize Bengali youth through a program of physical fitness and spiritual training for a nationalist program. By 1902, Calcutta had three societies working under the umbrella of Anushilan Samity, a society earlier founded by a Calcutta barrister by the name of Pramatha Mitra. These included Mitra's own group, another led by a Bengali lady by the name of Sarala Devi, and a third one led by Aurobindo Ghosh. The Anushilan Samiti had Aurobindo and Deshabandhu Chittaranjan Das as the vice-presidents, Suren Tagore the treasurer. Jatindra Nath Banerjee (Niralamba Swami), Bagha Jatin, Bhupendra Nath Datta (Swami Vivekananda's brother), Barindra Ghosh were among other initial leaders.
By 1905, the work of Aurobindo and his brother Barin Ghosh allowed Anushilan Samity to spread through Bengal.
Biren Dutta
Dutta was born in Agartala in 1910, son of Jogneswar Dutta. He studied at Calcutta University. He was linked to the Anushilan Samiti revolutionary movement. He was arrested in 1933. Just before his arrest he had come into contact with the communist movement. Dutta was released from jail in May 1938, after which he travelled back to Tripura to build a branch of the Communist Party there. His work was conducted under supervision of the Comilla Divisional Committee of the Communist Party. Dutta and his associated founded the Janamangal Samiti ('People's Welfare Association') in 1938. Dutta served as assistant secretary of Janamangal Samiti and was the editor/publisher of its publication "Projar Katha".