Anushilan Samiti
Anushilan Samiti (Ōnūshīlōn sōmītī, "lit": body-building society) was a Bengali Indian organisation that existed in the first quarter of the twentieth century, and propounded revolutionary violence as the means for ending British rule in India. The organisation arose from a conglomeration of local youth groups and gyms ("Akhara") in Bengal in 1902. It had two prominent, if somewhat independent, arms in East and West Bengal identified as Dhaka Anushilan Samiti centred in Dhaka (modern day Bangladesh), and the Jugantar group (centred at Calcutta) respectively.
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.