Barin Ghosh was the main leader.
Along with 21 revolutionaries including Bagha Jatin, he started to collect arms and explosives and manufactured bombs.
Some senior members of the group were sent abroad for political and military training.
One of them, Hemchandra Kanungo obtained his training in Paris.
After returning to Calcutta he set up a combined religious school and bomb factory at a garden house in Maniktola suburb of Calcutta.
However, the attempted murder of district Judge Kingsford of Muzaffarpur by Khudiram Bose and Prafulla Chaki (30 April 1908) initiated a police investigation that led to the arrest of many of the revolutionaries.
Jugantar, along with other revolutionary groups, and aided by Indians abroad, planned an armed revolt against the British rulers during the First World War.
This plan largely depended on the clandestine landing of German arms and ammunition in the Indian coast.
This plan came to be known as the Indo-German Plot.
However, the planned revolt did not materialise.
After the First World War Jugantar supported Gandhi in the Non-Cooperation Movement and many of their leaders were in the Congress.