Two bombs, a handful of leaflets, and a refusal to run
On the afternoon of 8 April 1929 two members of the Hindustan Socialist Republican Association threw explosives into the chamber of the Central Legislative Assembly in Delhi and then waited, deliberately, to be arrested. The action was designed to produce a trial. It succeeded, and the consequences reached Lahore.
The Central Legislative Assembly was the elected component of a constitutional arrangement that reserved final authority to the Viceroy. Two measures before it in the spring of 1929 concentrated the objection: the Public Safety Bill, which would have widened the government’s powers to deport and detain political agitators, and the Trade Disputes Bill, which restricted the right to strike at a moment of rising industrial organisation in India.
Both measures were opposed by Indian members. Neither opposition could be decisive, because the Viceroy retained the power to enact a measure the Assembly declined to pass. That structural fact — a legislature that could be overruled — was the HSRA’s argument in miniature.
The action
Bhagat Singh and Batukeshwar Dutt entered the visitors’ gallery and threw two low-intensity bombs into a section of the chamber chosen to avoid casualties. A small number of people present received minor injuries. The two men scattered printed leaflets, raised revolutionary slogans, and made no attempt to escape. They were arrested where they stood.
The leaflet they distributed took its argument from a remark attributed to the French anarchist Auguste Vaillant: that it takes a loud noise to make the deaf hear. The HSRA’s stated purpose was not to kill members of the Assembly — the design of the action makes that clear — but to force a hearing for a political case that constitutional channels had been structured to exclude.
Why arrest was the objective
This is the element most often lost in retelling. Escape was not attempted because escape would have defeated the purpose. A revolutionary who disappears leaves a police report. A revolutionary who stands trial gets a public courtroom, a national press gallery, and a statement from the dock reproduced in newspapers across India.
The strategy worked on its own terms. The Assembly Bomb Case, tried at Delhi, ended in sentences of transportation for life in June 1929, and made both men nationally known.
What it set in motion
It also did something the organisation had not intended. Custody meant identification. The investigation that followed — combined with the discovery of HSRA bomb-making premises at Lahore, Saharanpur and Agra, and with the decision of several members to turn approver — allowed the police to connect the men in custody to the shooting of J. P. Saunders in Lahore in December 1928.
That connection produced the Lahore Conspiracy Case. And it is the Lahore Conspiracy Case, not the Assembly action, that ended in three death sentences.
Correction — a persistent misattribution
Sukhdev Thapar was not present at the Central Legislative Assembly on 8 April 1929, and took no part in the action. He was in Punjab. The action was carried out by Bhagat Singh and Batukeshwar Dutt. Because the three men executed in 1931 are recited together, the Assembly bombing is frequently and wrongly credited to all three — in classroom summaries, in online material and in popular retelling. Sukhdev was sentenced to death for the conspiracy tried at Lahore, on charges arising from the Saunders shooting of 17 December 1928. He was never charged in connection with the events in Delhi.