strategy of tension and Years of Lead The period of the late 1960–1970s came to be known as the Opposti Estremismi, (from left-wing and right-wing extremists riots), later renamed anni di piombo ("Years of Lead") because of a wave of bombings and shootings – the first victim of this period was Antonio Annarumma, a policeman, killed on 12 November 1969 in Milan during a left-wing demonstration. In December, four bombings struck in Rome the Monument of Vittorio Emanuele II (Altare della Patria), the Banca Nazionale del Lavoro, and in Milan the Banca Commerciale and the Banca Nazionale dell'Agricoltura. The later bombing, known as the Piazza Fontana bombing of 12 December 1969, killed 16 and injured 90. On 17 May 1972, police officer Luigi Calabresi, who was subsequently awarded a gold medal of the Italian Republic for civil valour, was assassinated in Milan. Sixteen years later, Adriano Sofri, Giorgio Pietrostefani and Ovidio Bompressi and Leonardo Marino were arrested in Milan, accused by the confession of Leonardo Marino, one of the participants in the assassination. Highly controversial, the trial concluded, after an alternance of convictions and acquittals, to their guilt. During a ceremony in honour of Luigi Calabresi on 17 May 1973, where the Interior Minister Mariano Rumor was present, an anarchist, Gianfranco Bertoli, threw a bomb killing four and injuring 45. Count Edgardo Sogno revealed in his memoirs that in July 1974, he visited the CIA station chief in Rome to inform him of the preparation of a neo-fascist coup. Asking him what the US government would do in case of such an operation, Sogno wrote that the CIA officer responsible for Italy answered him that "the United States would have supported any initiative tending to keep the communists out of government." General Maletti declared, in 2001, that he had not known about Sogno's relations to the CIA and had not been informed of the right-wing coup, known as Golpe bianco (White Coup), and prepared with Randolfo Pacciardi. General Vito Miceli, chief of the SIOS military intelligence agency from 1969 on, and head of the SID from 1970 to 1974, was arrested in 1974 on charges of "conspiracy against the state". Following his arrest, the Italian secret services were reorganized with a 24 October 1977 law in a democratic attempt to regain civilian and parliamentary control of them. The SID was divided into the current SISMI, the SISDE and the CESIS,