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
In 1923, another Anushilan-linked group, the Hindustan Republican Association was founded in Benares in the United Provinces by Sachindranath Sanyal and Jogesh Chandra Chatterjee, and was influential in radicalising north India, it soon had branches from Calcutta to Lahore. A series of successful dacoities in UP culminated in the train robbery in Kakori. However, the subsequent investigations and two trials broke the organization. Several years later it would be reborn as the Hindustan Socialist Republican Association.