Anushilan Samiti
Anushilan Samiti (Ōnūshīlōn sōmītī, "lit": body-building society) was a Bengali Indian organisation that existed in the first quarter of the twentieth century, and propounded revolutionary violence as the means for ending British rule in India. The organisation arose from a conglomeration of local youth groups and gyms ("Akhara") in Bengal in 1902. It had two prominent, if somewhat independent, arms in East and West Bengal identified as Dhaka Anushilan Samiti centred in Dhaka (modern day Bangladesh), and the Jugantar group (centred at Calcutta) respectively.
Niralamba Swami
Aurobindo began devoting energy towards national activities. When Anushilan Samity was formed at Kolkata, Aurobindo sent a request to Jatindra Nath to join the organisation. So Jatindra Nath left his job in Baroda to join Anushilan Samity.He became one of its prominent members.