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.
Emperor vs Aurobindo Ghosh and others
Aurobindo Ghosh retired from active nationalist politics after serving a prison sentence awarded in the trial, beginning his journey into spirituality and philosophy that he described as having started with revelations that occurred to him during his incarceration. He later moved to Pondicherry, establishing an "Ashram". For "Anushilan samiti", the incarceration of many of its prominent leaders led to a decline in the influence and activity of the Manicktolla branch, and its activities were overtaken by what emerged to be called the "Jugantar" branch under the leadership of Bagha Jatin.