Bengal Anushilan SamitiMain article: Anushilan Samiti
Established by Pramath Nath Mitra in Kolkata in 1902, Anushilan Samity became one of the most organized revolutionary associations , especially in the Eastern Bengal where the Dhaka Anushilan Samiti had several branches and carried out major activities . Jugantar was initially formed by an inner circle of the Kolkata Anushilan Samiti, like the Palmach of Haganah. In the 1920s, the Kolkata faction supported Gandhi in the Non-Cooperation Movement and many of the leaders held high posts in Congress.
 JugantarBarin Ghosh was the main extremist leader. Along with 21 revolutionaries including Bagha Jatin, he started to collect arms and explosives and manufactured bombs. The headquarters of Jugantar was located at 93/a Baubazar Street, Kolkata.
Some senior members of the group were sent abroad for political and military training. One of them, Hemchandra Qanungo obtained his training in Paris. After returning to Kolkata he set up a combined religious school and bomb factory at a garden house in Maniktala 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.
Jatindranath Mukherjee (Bagha Jatin) in 1910Bagha Jatin was one of the top leaders in Jugantar. He was arrested, along with several other leaders, in connection with the Howrah conspiracy case. They were tried for treason, the charge being that they had incited various regiments of the army against the ruler.
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 ammunitions in the Indian coast. This plan came to be known as the Indo-German Plot. However, the planned revolt did not materialize.
After the First World War Jugantar supported Gandhi in the Non-Cooperation Movement and many of their leaders were in the Congress. Still, the group continued its revolutionary activities, a notable event being the Chittagong armoury raid.
Bengal VolunteersMain article: Bengal Volunteers
Bengal Volunteers was a group formed by Subhash Chandra Bose during the Kolkata session of Indian National Congress in 1928 to help the organisation of the session. However, afterwards the group turned into a revolutionary group with notable revolutionaries like Benoy-Badal-Dinesh being its members
Punjab Hindustan Socialist Republican AssociationMain article: Hindustan Socialist Republican Association
Hindustan Republican Association (HRA) was established in October 1924 in Kanpur by revolutionaries like Ramprasad Bismil, Jogesh Chatterjee, Chandrashekhar Azad, Yogendra Shukla and Sachindranath Sanyal. The aim of the party was to organize armed revolution to end the colonial rule and establish in a Federal Republic of the United States of India. The Kakori train robbery was a notable act of mutiny by this group. The Kakori case led to the hanging of Ashfaqullah Khan, Ramprasad Bismil, Roshan Singh, Rajendra Lahiri. The Kakori case was a major setback for the group. However, the group was soon reorganized under the leadership of Chandrashekhar Azad and with members like Bhagat Singh, Bhagwati Charan Vohra and Sukhdev on 9 and 10 September 1928- and the group was now christened Hindustan Socialist Republican Association (HSRA).
In Lahore on 17 December 1928, Bhagat Singh, Azad and Rajguru assassinated Saunders, a police official involved in deadly lathi-charge on Lala Lajpat Rai. Bhagat Singh and Batukeshwar Dutt threw a bomb inside the Central Legislative Assembly. The Assembly Bomb Case trial followed. Bhagat Singh, Sukhdev and Rajguru were hanged in 23 March 1931.
South IndiaThe uprising against the British was evidenced at Halagali (Mudhol taluk of Bagalkot district). The prince of Mudhol, Ghorpade had accepted British overlordship. But the Bedas (hunters), a martial community, were seething with dissatisfaction under the new dispensation. The British proclaimed the Disarming Act of 1857 whereby men possessing fire arms had to register them and secure a license before November 10, 1857. Babaji Nimbalkar, a soldier thrown out of job from Satara Court, had advised these people not to loose their hereditary right to own arms.
One of the leaders of the Bedas, Jadgia was invited by the administrator at Mudhol and was persuaded to secure a license on November 11, though Jadgia had not asked for it. The administrator’s expectation that others would follow Jadgia was belied. So he sent his agents to Halagali on November 15, 20 and again on 21. But the entreaties of the agents did not succeed, and the agents sent on November 21 were attacked by Jadgia and Baalya, another leader and they were forced to return. Another agent sent on November 25 was not allowed to enter the village.
Meanwhile, the Bedas and other armed men from the neighbouring villages of Mantur, Boodni and Alagundi assembled at Halagali. The administrator reported the matter to Major Malcolm, the Commander at the nearby army headquarters, who sent Col. Seton Karr to Halagali on November 29.
The insurgents, numbering 500 did not allow the British to enter Halagali. There was a fight during the night. On November 30, Major Malcolm came with 29th Regiment from Bagalkot. They set fire to the village and many insurgents, including Babaji Nimbalkar died. The British, who had a bigger army and better arms arrested 290 insurgents; and of these 29 were tried and 11 were hanged at Mudhol on December 11, and six others, including Jadagia and Baalya were hanged at Halagali on December 14, 1857. No prince or jagirdar was involved in this uprising, but it was the common soldiers. Violent revolutionary activities never took firm root in South India. The only violent act attributed to the revolutionaries was the assassination of Collector of Tirunelveli (Tinnevelly). On June 17, 1911, the Collector of Tirunelveli, Robert Ashe was killed by R. Vanchi Aiyer, who subsequently committed suicide. This was the only instance of a political assassination by a revolutionary in South India.
Outside India: India HouseMain article: India House
The India House was an informal Indian nationalist organisation that existed in London between 1905 and 1910. Initially begun by Shyamji Krishna Varma as a residence in Highgate, in NorthLondon, for Indian students to promote nationalist views and work, the house became a centre for intellectual political activities, and rapidly developed to be an organisation that became a meeting ground for radical nationalists among Indian students in Britain at the time, and of the most prominent centres for revolutionary Indian nationalism outside India. The Indian Sociologist published by the house was a noted platform for anti-colonial work and was banned in India as "seditious literature".
The India house was the beginnings of a number of noted Indian revolutionaries and nationalists, most famously V.D. Savarkar, as well as others of the like of V.N. Chatterjee, Lala Har Dayal, V.V.S. Iyer, M. P. T. Acharya who were, over the next decades, key members of revolutionary conspiracies in India as well as the founding fathers of Indian Communism. The house came to be the focus of Scotland Yard's work against Indian sedetionists, as well as the focus of work for the nascent Indian Political Intelligence Office. India house ceased to be potent organisation after its liquidation in the wake of the assassination of William Hutt Curzon Wyllie by a member of the India House by the name of Madan Lal Dhingra. This event marked the beginnings of London Police's crackdown on the activities of the house and a number of its activists and patrons, including Shyamji Krishna Varma and Bhikaji Cama moved to Europe from where they carried on works in support of Indian nationalism. Some Indian students, including Har Dayal, moved to the United States. The network that the House founded was key in the nationalist revolutionary conspiracy in India during World War I.
Gadar PartyMain article: Gadar Party
Gadar party was a predominantly Sikh organization that started operating abroad in 1913 "with the view to do-away with the British rule in India".. The party collaborated with revolutionaries inside India and helped them get arms and ammunition. Lala Hardayal was a prominent leader of the party and pramotor of the Gadar newspaper. The Komagata Maru incident in 1914 inspired several thousand Indians residing in the USA to sell their businesses and rush home in order to participate in the anti-British activities in India. The party had active members in India, Mexico, Japan, China, Singapore, Thailand, Philippines, Malaya, Indo-China and Eastern and Southern Africa. During World War I, it was amongst the chief pariticipants of the Hindu German Conspiracy.
Berlin CommitteeThe "Berlin committee for Indian independence" was established in 1915 by Virendra Nath Chattopadhya, including Bhupendra Nath Dutt & Lala Hardayal under "Zimmerman plan" with the full backing of German foreign office.
Their goal was mainly to achieve the following four objectives:
1: Mobilize Indian revolutionaries abroad. 2: Incite rebellion among Indian troops stationed abroad. 3: Send volunteers and arms to India. 4: Even to Organized an armed invasion of British India to liberate the country