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
When the Janshiksha Samiti ('People's Educational Association') was founded in 1945, Dutta played a key role as an organizer, albeit not officially being part of the leadership of the movement. Dutta obtained full membership in the Communist Party of India just before the 2nd party congress held in Calcutta. Dutta attended the congress. After party congress, Dutta sought to build a movement amongst the tribal people of Tripura. But soon the Tripura Government began a crack-down against the nascent communist movement. Dutta left for the hills, where he began to build a revolutionary movement, the Mukti Parishad ('Liberation Council'). Whilst Dutta was a key organizer of the movement, he did not join the executive of the organization as it was an organization of tribal people. Dutta and others in the leadership were arrested.