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.
Brahmo Samaj
Brahmo Samaj (Bengali: ব্রাহ্ম সমাজ "Bramho Shômaj") is the societal component of Brahmoism, which began as a monotheistic reformist movement of the Hindu religion that appeared during the Bengal Renaissance. It is practised today mainly as the Adi Dharm after its eclipse in Bengal consequent to the exit of the Tattwabodini Sabha from its ranks in 1839. After the publication of Hemendranath Tagore's Brahmo "Anusthan" (code of practice) in 1860 which formally divorced Brahmoism from Hinduism, the first Brahmo Samaj was founded in 1861 at Lahore by Pandit Nobin Chandra Roy.