History of the Anushilan Samiti
Around 1902, Aurobindo Ghosh arranged for Bannerjee to return to Calcutta to begin organisational work, where he began a gymnasium and a youth society. It was at this time that Bannerjee came in touch with Vibhuti Bhushan Bhattacharya, Sarala Devi Ghoshal and Pramathanath Mitra. In Calcutta, a few clubs and societies were still active at the time. Most notable was a gymnasium in Ballygunge Circular Road run by Sarala Devi herself, a second was an organisation named "Anushilan Samiti" founded by Satish Chandra Basu with the patronage of Pramathanath Mitra. A third one was a youth club called "Attōnnōti Samiti" (Self-improvement society) in central Calcutta.
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.