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.
Bhavabhushan Mitra
In 1900, invited by Suren at his Kolkata residence, Jatin and Bhavabhushan attended a meeting where Kakuzo Okakura, the Japanese dreamer of the movement "Asia is One," was presented to dignitaries like Sister Nivedita, the barrister P. Mitter, Shashibhushan Raychaudhury including members of the Tagore family (Sarala Devi Tagore, Rabindranath, Abanindranath Tagore). Like other patriots, too, Bhavabhushan was to be impressed by the Japanese victory over Russia in 1905, and admired Japan as an Asiatic power. Even in 1937, as a tribute to the Japanese admiral, he christened one of Jatin's grandsons as Togo. At Kolkata, Bhavabhushan noticed young Jatin's popularity among the seasoned personalities. Especially he found Mitter encouraging Jatin in his mission of preparing youths for an extremist uprising against the colonial rulers. As soon as the Kolkata Anushilan Samiti was inaugurated in 1902, with the help of Bhavabhushan and other associates, Jatin opened its branches in Kushtia and neighbouring towns. As Jatin's messengers, on several occasions Bhavabhushan and Chandi Majumdar used to meet Sarala Devi, Nivedita, P. Mitter, Bipin Chandra Pal, Krishnakumar Mitra.