 Revolutionaries trained by him were responsible for the assassination of three District Magistrates in succession, Douglas, Burge, and Peddy.The association targeted Col NS Simpson, the Inspector General of Prisons, who was infamous for the brutal oppression of the prisoners in the jails.The revolutionaries decided not only to murder him, but also to strike a terror in the British official circles by launching an attack on the Secretariat Building - the Writers' Building in the Dalhousie Square in Kolkata.