Indian revolutionaries Bhagat Singh, Sukhdev Thapar and Shivaram Rajguru assassinate British police officer James Saunders in Lahore, Punjab, to avenge the death of Lala Lajpat Rai at the hands of the police. The three were executed in 1931.

Bhagat Singh was an Indian anti-colonial revolutionary who participated in the mistaken murder of a junior British police officer in December 1928 in what was intended to be retaliation for the death of an Indian nationalist. He later took part in a largely symbolic bombing of the Central Legislative Assembly in Delhi and a hunger strike in jail, which—on the back of sympathetic coverage in Indian-owned newspapers—turned him into a household name in the Punjab region, and, after his execution at age 23, a martyr and folk hero in Northern India. Borrowing ideas from Bolshevism and anarchism, the charismatic Bhagat Singh electrified a growing militancy in India in the 1930s and prompted urgent introspection within the Indian National Congress's nonviolent, but eventually successful, campaign for India's independence.

Sukhdev Thapar was an Indian freedom fighter who fought against the British government for Indian independence. He was a member of the Hindustan Socialist Republican Association (HSRA), and was executed along with Shivaram Rajguru and Bhagat Singh on 23 March 1931.

Shivaram Hari Rajguru was an Indian anti-colonial revolutionary and independence activist. He is best known for his involvement in the 1928 assassination of a British police officer named John Saunders. He was an active member of the Hindustan Socialist Republican Association (HSRA) and on 23rd March 1931, he was hanged by the British government along with his associates Bhagat Singh and Sukhdev Thapar.

Lahore is the capital and largest city of the Pakistani province of Punjab. It is the second-largest city in Pakistan, after Karachi, and 27th largest in the world, with a population of over 14 million. Lahore is one of Pakistan's major industrial, educational and economic hubs. It has been the historic capital and cultural centre of the wider Punjab region, and is one of Pakistan's most socially liberal, progressive, and cosmopolitan cities.