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.
Anushilan Samiti
From its foundation to its gradual dissolution during the 1930s, the "Samiti" challenged British rule in India by engaging in militant nationalism, including bombings, assassinations, and politically-motivated violence. During its existence, the "Samiti" collaborated with other revolutionary organisations in India and abroad. It was led by nationalists such as Aurobindo Ghosh and his brother Barindra Ghosh, and influenced by philosophies as diverse as Hindu "Shakta" philosophy propounded by Bengali literaetuer Bankim and Vivekananda, Italian Nationalism, and Pan-Asianism of Kakuzo Okakura. The "Samiti" was involved in a number of noted incidences of revolutionary attacks against British interests and administration in India within the decade of its founding, including early attempts to assassinate Raj officials whilst led by the Ghosh brothers. These were followed by the 1912 attempt on the life of the Viceroy of India, and the Sedetious conspiracy during World War I led by Rash Behari Bose and Jatindranath Mukherjee respectively.