You should investigate CIA/NATO funded clandestine operations such us GLADIO involving terror attacks in Europe against civilians. AKA "strategy of tension".
https://en.wikipedia.org/wiki/Operation_Gladio
https://en.wikipedia.org/wiki/Propaganda_Due
https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=OJ:J...
>The August 2, 1980 bombing of the Bologna train station which killed 85 people, is widely recognized as a Gladio operation. While it was initially blamed on the communist “Red Brigades,” eventually, right-wing and fascists elements were discoverd to be the culprits. Two Italian secret service agents and Licio Gelli, the head of the infamous P2 Masonic lodge, were convicted in connection to the bombing.
>1969: “In Italy, the Piazza Fontana massacre in Milan kills 16 and injures and maims 80 [….] during a trial of rightwing extremists General Giandelio Maletti, former head of Italian counterintelligence, alleges that the massacre had been carried out by the Italian stay-behind army and rightwing terrorists on the orders of the US secret service CIA in order to discredit Italian Communists.”