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
When the "Samiti" first came into prominence following the Muzaffarpur killings, its ideology was felt to be influenced by European anarchism. Lord Minto resisted the notion that its action may be the manifestation of political grievance by concluding that: 
However others disagreed. John Morley was of the opinion that political violence exemplified by the "Samiti" were manifestations of Indian antagonism to the government, and was running a natural course which was culminating in assassinations. Historians conclude that although there were influences of European nationalism and philosophies of liberalism. In Bengal at large, through the decades 1860s and 1870s, there arose large numbers of "akhras", or gymnasiums consciously designed along the lines of the Italian Carbonari which drew the youth. These were influenced by the works of Italian nationalist Giuseppe Mazzini and his Young Italy movement. Aurobindo himself studied the revolutionary nationalism of Ireland, France and America. Hem Chandra Das, during his stay in Paris, is also noted to have interacted with European radical nationalists in the city, returning to India an atheist and Marxist.