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.
History of the Anushilan Samiti
Through the twenties and thirties, many Anushilan members began identifying with Communism and leftist ideologies. Former Jugantar leader Narendranath Bhattacharya, now known as M. N. Roy, became an influential member of the Communist International, helping to find the Communist Party of India. Particularly during the mass detentions of the 1930s around the Civil Disobedience Movement, many members were won over to the party. By the end of that decade a number of left-wing parties were competing for the youth of Bengal. Most were aimed at broad-based class warfare, opposed to terrorism in principle. Those who did not join left-wing parties identified more closely with Congress.
Jugantar was formally dissolved in 1938, many former members continued to act together under Surendra Mohan Ghose, who acted as a liaison between other Congress politicians and Aurobindo Ghose in Pondicherry.