Udham Singh was an Indian revolutionary belonging to Ghadar Party and HSRA, best known for assassinating Michael O'Dwyer, the former lieutenant governor of the Punjab in India, on 13 March 1940. The assassination was done in revenge for the Jallianwala Bagh massacre in Amritsar in 1919, for which O'Dwyer was responsible and of which Singh himself was a survivor. Singh was subsequently tried and convicted of murder and hanged in July 1940. While in custody, he used the name 'Ram Mohammad Singh Azad', which represents the three major religions in India and his anti-colonial sentiment.

The Ghadar Movement or Ghadar Party was an early 20th century, international political movement founded by expatriate Indians to overthrow British rule in India. Many of the Ghadar Party founders and leaders, including Sohan Singh Bhakna, would go on and join the Babbar Akali Movement and would help it in logistics as a party and publishing its own newspaper in the post-World War 1 era. The early movement was created by revolutionaries who lived and worked on the West Coast of the United States and Canada, but the movement later spread to India and Indian diasporic communities around the world. The official founding has been dated to a meeting on 15 July 1913 in Astoria, Oregon, and the group would splinter into two factions the first time in 1914, with the Sikh-majority faction known as the “Azad Punjab Ghadar” and the Hindu-majority faction known as the “Hindustan Ghadar.” The Azad Punjab Ghadar Party’s headquarters and anti-colonial newspaper publications headquarters would remain in the Stockton Gurdwara located in Stockton, California, whereas the Hindustan Ghadar Party’s headquarters and Hindustan Ghadar newspaper would relocate to be based in nearby Oakland, a suburb of San Francisco, California.