The last and largest of the bombings , known as the Bologna massacre , destroyed the city 's railway station in 1980 . This was found to be a neofascist bombing , in which Propaganda Due was involved . On 24 October 1990 , Prime Minister Giulio Andreotti ( DC ) revealed to the Parliament the existence of Gladio , NATO 's secret " stay-behind " networks which stocked weapons in order to facilitate an armed resistance in case of a communist coup . In 2000 , a Parliament Commission report from the Olive Tree ( centre-left ) coalition concluded that the strategy of tension followed by Gladio had been supported by the United States to " stop the PCI and , to a certain degree , the PSI Italian Socialist Party from reaching executive power in the country "
Bologna massacre
Bologna massacre
Politics of Italy