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
As the Congress-led movement picked up its pace during the early 1930s, some former revolutionaries identified with the Gandhian political movement and became influential Congressmen (notably Surendra Mohan Ghose). Many Bengali Congressmen also maintained links with the Anushilan groups, and their revolutionary ideology and approach had not died away. In April 1930, Surya Sen and his associates raided the Chittagong Armoury. The Gandhi-led Salt March also saw the most active period of revolutionary terrorism in Bengal since World War I. In 1930 eleven British officials were killed, notably during the Writer’s Building raid of December 1930 by Benoy Basu, Dinesh Gupta and Badal Gupta. Three successive district magistrates in Midnapore were assassinated, and dozens of other actions were carried out during the first half of the decade. Although by 1931 a record 92 violent incidents were recorded, including the murders of the British magistrates of Tippera and Midnapore, the terrorist movement in Bengal may be said to have ended in 1934.