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.
Anirvan
At 16, he joined the Assam Bangiya Saraswata Math (the "ashram"), located in the village of Kokilamukh near Jorhat in Assam. He was a disciple of the ashram's founder, Paramahansa Srimat Swami Nigamananda Saraswati Dev, who initiated him into sannyas. Anirvan's new monastic name was Nirvanananda Saraswati. He taught at the ashram school and edited its monthly magazine "Aryyadarpan". In fact, the Aryadarpan still retains the following Sanskrit epigram, in the Rathoddhata metre, that Sri Anirvan (then Srimat Varada Brahmacari) wrote: arya-sastra-gahanartha-dipakascetas-timiravaravarakah/ dyotayan vijayatam vipascitam arcisa hrdayam aryadarpanah//