Bhagat Singh (27 September 1907 23 March 1931) was a charismatic Indian revolutionary who participated in the mistaken murder of a junior British police officer in what was 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 prison, whichon the back of sympathetic coverage in Indian-owned newspapersturned him into a household name in Punjab region, and after his execution at age 23 into a martyr and folk hero in Northern India. Borrowing ideas from Bolshevism and anarchism, he 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.In December 1928, Bhagat Singh and an associate, Shivaram Rajguru, both members of a small revolutionary group, the Hindustan Socialist Republican Association (also Army, or HSRA), shot dead a 21-year-old British police officer, John Saunders, in Lahore, Punjab, in what is today Pakistan, mistaking Saunders, who was still on probation, for the British senior police superintendent, James Scott, whom they had intended to assassinate. They held Scott responsible for the death of a popular Indian nationalist leader Lala Lajpat Rai for having ordered a lathi (baton) charge in which Rai was injured and two weeks thereafter died of a heart attack. As Saunders exited a police station on a motorcycle, he was felled by a single bullet fired from across the street by Rajguru, a marksman. As he lay injured, he was shot at close range several times by Singh, the postmortem report showing eight bullet wounds. Another associate of Singh, Chandra Shekhar Azad, shot dead an Indian police head constable, Channan Singh, who attempted to give chase as Singh and Rajguru fled.After having escaped, Bhagat Singh and his associates used pseudonyms to publicly announce avenging Lajpat Rai's death, putting up prepared posters that they had altered to show John Saunders as their intended target instead of James Scott. Singh was thereafter on the run for many months, and no convictions resulted at the time. Surfacing again in April 1929, he and another associate, Batukeshwar Dutt, set off two low-intensity homemade bombs among some unoccupied benches of the Central Legislative Assembly in Delhi. They showered leaflets from the gallery on the legislators below, shouted slogans, and allowed the authorities to arrest them. The arrest, and the resulting publicity, brought to light Singh's complicity in the John Saunders case. Awaiting trial, Singh gained public sympathy after he joined fellow defendant Jatin Das in a hunger strike, demanding better prison conditions for Indian prisoners, the strike ending in Das's death from starvation in September 1929.

Bhagat Singh was convicted of the murder of John Saunders and Channan Singh, and hanged in March 1931, aged 23. He became a popular folk hero after his death. Jawaharlal Nehru wrote about him: "Bhagat Singh did not become popular because of his act of terrorism but because he seemed to vindicate, for the moment, the honour of Lala Lajpat Rai, and through him of the nation. He became a symbol; the act was forgotten, the symbol remained, and within a few months each town and village of the Punjab, and to a lesser extent in the rest of northern India, resounded with his name." In still later years, Singh, an atheist and socialist in adulthood, won admirers in India from among a political spectrum that included both communists and right-wing Hindu nationalists. Although many of Singh's associates, as well as many Indian anti-colonial revolutionaries, were also involved in daring acts and were either executed or died violent deaths, few came to be lionised in popular art and literature as did Singh, who is sometimes referred to as the Shaheed-e-Azam ("Great martyr" in Urdu and Punjabi).

The Indian independence movement was a series of events during the British Raj, starting with the aim of ending British rule in India on the Indian subcontinent and it ended with India being partitioned and getting Independence in August 1947.The first nationalistic revolutionary movement for Indian independence emerged from Bengal. It later took root in the newly formed Indian National Congress with prominent moderate leaders seeking the right to appear for Indian Civil Service examinations in British India, as well as more economic rights for natives. The first half of the 20th century saw a more radical approach towards self-rule by the Lal Bal Pal triumvirate, Aurobindo Ghosh and V. O. Chidambaram Pillai.The last stages of the self-rule struggle from the 1920s was characterized by Congress' adoption of Gandhi's policy of non-violence and civil disobedience. Intellectuals such as Rabindranath Tagore, Subramania Bharati, and Bankim Chandra Chattopadhyay spread patriotic awareness. Female leaders like Sarojini Naidu, Pritilata Waddedar, and Kasturba Gandhi promoted the emancipation of Indian women and their participation in the freedom struggle. B. R. Ambedkar championed the cause of the disadvantaged sections of Indian society.Some leaders followed a more violent approach. This became especially popular after the Rowlatt Act, which permitted indefinite detention. The Act sparked protests across India, especially in Punjab Province (British India) where they were violently surpressed in the Jallianwala Bagh massacre. Frustrated by perceived Congress inaction, revolutionaries such as Bhagat Singh, Shivaram Rajguru, Sukhdev Thapar, Chandra Shekhar Azad, and Subhas Chandra Bose resorted to violent means. Bose famously allied himself with the Axis powers and formed the Azad Hind. Meanwhile, Singh, Rajguru, Thapar, and Azad assassinated key British officers, and bombed Government buildings.

The Indian independence movement was in constant ideological evolution. Essentially anti-colonial, it was supplemented by visions of independent, economic development with a secular, democratic, republican, and civil-libertarian political structure. After the 1930s, the movement took on a strong socialist orientation. It culminated in the Indian Independence Act 1947, which ended suzerainty in India and created Pakistan.

India remained a Crown Dominion until 26 January 1950, when the Constitution of India established the Republic of India. Pakistan remained a dominion until 1956 when it adopted its first constitution. In 1971, East Pakistan declared its own independence as Bangladesh.