Initial steps to organize the revolutionaries were taken by Aurobindo Ghosh

Revolutionary movement for Indian independence
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Beginning: Apart from a few stray incidents, the armed rebellion against the British rulers were not organized before the beginning of the 20th century. The revolutionary philosophies and movement made its presence felt during the 1905 Partition of Bengal.

Arguably, the initial steps to organize the revolutionaries were taken by Aurobindo Ghosh, his brother Barin Ghosh, Bhupendranath Datta and Raja Subodh Mallik when they formed the Jugantar party in April 1906 [1].Jugantar was created as an inner circle of the Anushilan Samiti which was already present in Bengal mainly as a fitness club...

Main article: Jugantar
Barin Ghosh was the main extremist leader. Along with 21 revolutionaries including Bagha Jatin, he started to collect arms and explosives and manufactured bombs. The head quarters of Jugantar was located at 93/a Baubazar Street, Kolkata.