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.
Shanti Ashram
"Shanti Ashram" was founded for the first time by Nigamananda on Akshay Tritiya at Kumilla Durgapur in 1314 B.S. The ashram was shifted to Gendaria in Dhaka in 1318 B.S. "Sri Gouranga Anath Niketan" was founded there on the 26th Agrahayana 1318 B.S. The purpose behind it is to serve the distressed, the grieved, the sick and the poor.
There was a disciple of named "Saruram Kalita" purchased a plot of 80 bighas at "Kumarveti Chapri village" of "Kokilamukh", Jorhat in Sibsagar district after taking money from Nigamananda. The Math was instituted on the land. Nigamananda himself founded the "asan" (seat) of Brahama at "Kokilamukh" near Jorhat on the occasion of Akshay Tritiya on 7th Baisakh 1319 B.S. and named it Shanti Ashram.
Seven self-denying swami disciples (Chidananda, Premananda, Swarupananda, Yogananda, Suddhananda, Bodhananda and Saradananda) were initiated in asceticism by Nigamananda. He named this ashram as "Saraswat Math". It has been called "Assam Bangiya Saraswat Math" since 1325 B.S. Being an ascetic relating to the title of "Saraswati" (tradition name) under the Sringeri Math Nigamananda gives the name to his Math as "Saraswata Matha".