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.
Mokshadacharan Samadhyayi
Nanigopal and Jatindra had originally been members of the Kolkata Anushilan Samiti and acted directly under Sri Aurobindo's guidance, maintaining a constant collaboration. After quarrelling with Satish Basu, Nanigopal absorbed most of the members of Mokhoda-cum-Kartik's dispersed group, since the latter's arrest. Amaresh and Satish Sarkar worked under Jatindranath Mukherjee. Belonging to Indra's group (Atmonnati), Bepin Ganguli, Noren Bose and Noren Chatterji, too remained close to Jatindra's policy. These revolutionaries committed sixteen outrages between March 1908 and October 1909. Denham noted in 1909 on the 'Sarathi Jubak Mandali': "perhaps second only in importance to the Anushilan Samiti for the number of persons included in its ranks who actually took part in crimes of violence".