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.
History of the Anushilan Samiti
At this point the Anushilan Marxists, recently released from long jail sentences, stood at a cross-roads. Either they would continue as a separate political entity or they would join an existing political platform. They felt that they lacked the resources to build a separate political party. Joining the CPI was out of the question, due to sharp differences in political analysis. Neither could they reconcile their differences with the Royists. In the end, the Congress Socialist Party, appeared to be the sole platform acceptable for the Anushilan Marxists. The CSP had adopted Marxism in 1936 and their third conference in Faizpur they had formulated a thesis that directed the party to work to transform the Indian National Congress into an anti-imperialist front.