HARNĀM SIṄGH ṬUṆḌĪLĀṬ (1882-1962), a Ghadr revolutionary, was born, in March 1882, the son of Gurdit Siṅgh a farmer of modest means, of Koṭlā Naudh Siṅgh, in Hoshiārpur district of the Punjab. He learnt to read Gurmukhī in the village dharamsālā and joined the Indian army as he grew up. On 12 July 1906, he emigrated to Canada and thence to California in the United States of America in December 1909. There he worked in a lumber mill at Bridalville, Oregon. He attended a meeting of Indian immigrants at Portland in the beginning of 1912 which led to the formation of Hindustānī Workers of the Pacific Coast, later renamed Hindī Association of the Pacific Coast, but popularly known as the Ghadr Party. The first meeting of the Association was held on 31 March 1913 at Bridalville, where Harnām Siṅgh was elected secretary of the local branch. In a party meeting at Sacramento on 31 December 1913, he was made a member of the central executive. Meanwhile, it had been decided to launch a weekly paper, Ghadr (literally rebellion), to be published in Urdu, Punjabi, Hindi and other Indian languages. The first issue of the Ghadr in Urdu appeared on 1 November 1913, and its Punjabi edition followed in January 1914. To begin with, Lālā Hardayāl was its editor, with Kartār Siṅgh Sarābhā and Raghubīr Dayāl as assistant editors. Later, Harnām Siṅgh, with a few others, was also invited to join the editorial board. He wrote verse in Punjabi and contributed to the paper poems burning with patriotic fervour. He also acted as a bodyguard to Lālā Hardayāl, the party general secretary.

         With the expulsion of Lālā Hardayāl from America in April 1914, party work at the Yugāntar Āshram, its headquarters in San Francisco, was redistributed. Harnām Siṅgh was made editor of the Ghadr, with four others to assist him. Talk of an impending war between Great Britain and Germany was in the air, and the programme of the Ghadr Party was directed towards a planned rebellion in India as the British got involved in Europe. While Ūdham Siṅgh Kasel started imparting military training to party volunteers and Kartār Siṅgh Sarābhā went to the eastern coast to train as a flier-cum-aircraft mechanic, Harnām Siṅgh learnt bomb-making from an American friend. During an experiment, on 5 July 1914, his left hand was blown off as a result of which his left arm had to be amputated well above the wrist. He was given by his comrades the new name of Ṭuṇḍīlāṭ, the armless Lord. The epithet contained an ironic allusion to Sir Henry Hardinge, governor-general of India (1844-48) at the time of the first Anglo-Sikh war, who was called by the Punjabis Ṭuṇḍā Lāṭ because of his having lost a limb during the Napoleonic Wars. Upon the outbreak of World War I on 25 July 1914, the Ghadr Party directed its members and sympathizers to return to India forthwith. Harnām Siṅgh came via Colombo and arrived in the Punjab on 24 December 1914. Disguised as a holy man in ochre robes, he roamed the Doābā villages preaching the message of Ghadr. He also contacted, at the behest of the party, troops in Rāwālpiṇḍī, Bannū, Nowsherā and Peshāwar cantonments. The plan for a military and general rising on 21 February 1915, later advanced to 19 February 1915, having failed owing to betrayal by a police agent smuggled into the party cadre, Harnām Siṅgh Ṭuṇḍīlāṭ along with Kartār Siṅgh Sarābhā and Jagat Siṅgh of Sursiṅgh escaped to the North-West Frontier Province to seek temporary refuge in Afghanistan and plan afresh. But receiving no support from that government, they turned back and arrived, on 2 March 1915, at Wilsonpur, a remount farm in Chakk No. 5 in Shāhpur (Sargodhā) district, to stay with one Rājindar Siṅgh, a military pensioner and an acquaintance of Jagat Siṅgh, himself an ex-soldier. Rājindar Siṅgh, however, betrayed them to the police through Risāldār Gaṇḍā Siṅgh of Gaṇḍīviṇḍ, who held charge of a remount farm. All the three were arrested and taken to Lahore Central Jail, where they were tried in what is known as the First Lahore Conspiracy case. The trial by a special tribunal under the Defence of India Act 1914 began on 26 April 1915 and the judgement was delivered on 13 September 1915. Harnām Siṅgh Ṭuṇḍīlāṭ was one of the twenty-four sentenced to death with forfeiture of property. The Ghadr leaders refused to file an appeal, but the Viceroy on his own commuted the death penalty into life imprisonment in the case of seventeen of them, including Harnām Siṅgh. He served six years in the Aṇḍamans and nine years in other jails in Madrās, Puṇe, Bombay and Montgomery. On 15 September 1930, he was released on medical grounds. He served another term in jail from 1941 to 1945. At the time of inter-communal turbulence in 1947, he helped Muslim residents of his village and the surrounding area to evacuate to refugee camps.He died on 18 September 1962 after a brief illness.

         Harnām Siṅgh was a revolutionary poet and a writer of prose of considerable merit. Three collections of his poems have been published Harnām Lahirāṅ, Kurītī Sudhār and Harnām Sandesh. His prose works include Sachchā Saudā, AKhlāq te Mazhab, both in Punjabi, and Mazhab aur Insānīat, in Urdu.