 Complete the following phrase:  As a PIDE agent the secret police of the Portuguese dictatorship, Monteiro carried out the high-profile assassinations of Humberto Delgado, who was a political opposition leader to Salazars Estado Novo; and Eduardo Mondlane, leader of FRELIMO; in addition to this he also brutally tortured an uncertain number of Goans who advocated for the union of Goa with India, something which did happen on mid-1954 with the Indian annexation of Dadra and Nagar Haveli and 