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.
Revolutionary Socialist Party (India)
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.