Punjabi revolutionary Udham Singh is executed in Pentonville Prison, London, ​for his assassination of the Governor of Punjab, Michael O’Dwyer, the man responsible for the Amritsar Massacre of 1919, in Caxton Hall, London, on 13 March 1940. Singh, a skilled electrician, had formed the first Indian Workers’ Association (IWA) in Coventry in 1938.