Udham Singh ( 26 December 1899 – 31 July 1940 ) , was a revolutionary belonging to the Ghadar Party best known for his assassination in London of Michael O ' Dwyer , the former lieutenant governor of the Punjab in India , on 13 March 1940 . The assassination was in revenge for the Jallianwala Bagh massacre in Amritsar in 1919 . 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 of Punjab and his anti-colonial sentiment
Jallianwala Bagh massacre
Jallianwala Bagh massacre
Udham Singh