Anushilan Samiti
By 1902, Calcutta had three secret societies working toward the violent overthrow of British rule in India. One was founded by Calcutta student Satish Chandra Basu with the patronage of Calcutta barrister Pramatha Mitra, another was led by Bengali woman Sarala Devi and the third was founded by Aurobindo Ghosh. Ghosh was one of the strongest proponents of militant Indian nationalism at the time. By 1905 the work of Aurobindo and his brother, Barin, enabled Anushilan Samity to spread throughout Bengal. Nationalist writings and publications by Aurobindo and Barin, including "Bande Mataram" and "Jugantar", had a widespread influence on Bengal youth. The 1905 partition of Bengal stimulated radical nationalist sentiments in Bengal's Bhadralok community, helping Anushilan acquire a support base of educated, politically-conscious and disaffected members of local youth societies. Its program emphasized physical training, training its recruits with daggers and "lathis" (bamboo staffs used as weapons). The Dhaka branch of Anushilan was led by Pulin Behari Das, and branches spread throughout East Bengal and Assam. More than 500 branches were opened in eastern Bengal and Assam, linked by "close and detailed organization" to Pulin's headquarters at Dhaka. It absorbed smaller groups in the province, soon overshadowing its parent organisation in Calcutta. Branches of Dhaka Anushilan emerged in Jessore, Khulna, Faridpur, Rajnagar, Rajendrapur, Mohanpur, Barvali and Bakarganj. Estimates of Dhaka Anushilan Samiti's reach indicate a membership of 15,000 to 20,000. Within two years, Dhaka Anushilan devolved its aims from the Swadeshi to that of political terrorism.
Anushilan Samiti
At least initially, membership was predominantly Hindus, which was ascribed to the religious oath of initiation and was unacceptable to Muslims. Each member was assigned to one or more of three roles. These included collection of funds, implementation of planned actions and propaganda respectively. In practice, however, the fundamental division was between what was conceived as "military’’ work and ‘‘civil’’ work. "Dal"s (teams) consisting of five or ten members led by a "dalpati" (teamleader) were grouped together in local "samiti"s led by "adhyakshas" (executive officer) and other officers. These reported to district officers appointed by and responsible to the central Dhaka organization. This was commanded by Pulin Das and those who succeeded him during his periods of imprisonment. "Samitis" were divided into four functional groups: violence, organisation, keepers of arms, householder department. Communications were by special couriers and were written in secret code. This practice and many others were taken from literary sources and were in part a concession to the young men’s need to act out romantic drama. Less is known about the "Jugantar" network, which took the place of the Maniktala society after Alipore Bomb case. It faced divisions similar to "Anushilan". Historian Leonard Gordon notes that at least in the period between 1910 and 1915, each group "dal" in the "Jugantar" network were separate units composed of a leader known as "dada" ("lit": elder brother), and his followers. The "dada" was also guru, tutoring those under his command, practical skills, revolutionary ideology and strategy. Gordon suggests that the dada system developed out of pre-existing social structures in rural Bengal. "Dada"s both co-operated and competed with each other for men, money and material.