 Simpson of the Indian Imperial Police and the then Inspector General of Police(Prisons), who was infamous for inflicting the worst of atrocities on the inmates of the jails.The revolutionaries decided not only to murder him, but also to strike terror in the British official circles by launching an attack on the Secretariat Building – the Writers' Building in the Dalhousie square in Kolkata.On 8 December 1930, Benoy along with Dinesh Gupta and Badal Gupta, dressed in European attire, entered the Writers' Building and shot dead Simpson in his office.