1967 that led to the Greek junta. These fears were not completely unfounded as there had been two attempted coups in Italy, Piano Solo in 1964 and Golpe Borghese in 1970, by military and neo-fascist groups. The PCI's Giorgio Amendola formally requested Soviet assistance to prepare the party in case of such an event. The KGB drew up and implemented a plan to provide the PCI with its own intelligence and clandestine signal corps. From 1967 through 1973, PCI members were sent to East Germany and Moscow to receive training in clandestine warfare and information gathering techniques by both the Stasi and the KGB. Shortly before the 1972 Italian general election, Longo personally wrote to Leonid Brezhnev asking for and receiving an additional $5.7 million in funding. This was on top of the $3.5 million that the Soviet Union gave the PCI in 1971. The Soviets also provided additional funding through the use of front organisations providing generous contracts to PCI members. Leadership of Enrico Berlinguer In 1969, Enrico Berlinguer, the PCI deputy national secretary and later secretary general, took part in the international conference of the Communist parties in Moscow, where his delegation disagreed with the official political line and refused to support the final report. Unexpectedly to his hosts, his speech challenged the Communist leadership in Moscow. He refused to excommunicate the Chinese Communists and directly told Brezhnev that the Warsaw Pact invasion of Czechoslovakia, which he called "the tragedy in Prague", had made clear the considerable differences within the Communist movement on fundamental questions, such as national sovereignty, socialist democracy, and the freedom of culture. At the time, the PCI, which had absorbed the PSI's left-wing, the Italian Socialist Party of Proletarian Unity, so strengthening its leadership over the Italian left, was the largest Communist party in a capitalist state, garnering 34.4% of the vote in the 1976 Italian general election. Relationships between the PCI and the Soviet Union gradually fell apart as the party moved away from Soviet obedience and Marxist–Leninist orthodoxy in the 1970s and 1980s and toward Eurocommunism and the Socialist International. The PCI sought a collaboration with the Socialist and Christian Democracy parties, a policy known the Historic Compromise. The kidnapping and murder of Aldo Moro, the DC leader, by the Red Brigades in May 1978 put an end to any hopes of such a compromise. The compromise was largely abandoned as a