In 1923 A.D. Bhagat Singh took the membership of ‘Hindustan Republican Army’ formed by Chandra Sekhar.
Bhagat Singh himself also formed a youth organization named ‘Naojawan Bharat Sabha’ in 1925 A.D. His main followers were Ram Prasad Bismil, Roshan Lal,Ashfaqulla, Dinanath, Avadh Behari etc.
‘Kakori Conspiracy Case’ was started on the basis of rail dacoity on 8th August, 1925 A.D. After that, he assassinated Mr. Saunders, the Police Superintendent of Lahore on 17th November, 1928 A.D. because he charged lathi on Lala Lajpat Roy for the anti-Simon commission Movement. This was in retaliation of the death of Lajpat Roy. After that, Bhagat Singh and Batukeswar Dutta threw powerful bombs inside the Central Legislative Assembly Hall of Delhi from the public gallery on 8th April, 1929 A.D. when the discussion was going on for passing “Trade Dispute Bill” and “Public Safety Act”. Both these bills were against the public interest.
After that, both of them surrendered of their own. Later other revolutionists like Rajguru and Sukhdev along with others were arrested. The historic ‘Lahore Conspiracy Case’ started (1929 A.D.). In a trial, Bhagat Singh, Batukeswar Dutta, Sukhdev and Rajguru were sentenced to be hanged on 23rd March, 1931 A.D. Before stepping into the hanging platform Bhagat Singh shouted “Inqilab Jindabad” i.e. “Long live revolution”.