1)
https://en.wikipedia.org/wiki/Disappearance_of_Emanuela_Orlandi
Young vatican citizen abruptly disappears in Rome and is never seen again. An interesting web of conspiracies is uncovered by the prosecutors trying to find her.
2)
https://en.wikipedia.org/wiki/Italian_Unabomber
An unknown maniac, dubbed "Italian unabomber" by the press, crafted small explosives and inserted them into common objects (food packages, toothpaste, eggs, toys, highlighters, etc.) so that random people would lose their limbs or hands.
3)
https://en.wikipedia.org/wiki/State-Mafia_Pact
Did the Italian government end the series of terror attacks orchestrated by the Sicilian mafia in the 1990s, by secretly making a deal with its now deceased top boss?
4)
https://en.wikipedia.org/wiki/Roberto_Calvi
Financier who oversaw a scandal-hit Holy See bank dies by hanging in London, where he's found hanged under the Blackfriars Bridge. His death is ruled a murder but the culprit is never found.
5)
https://en.wikipedia.org/wiki/Propaganda_Due
An ever present secret masonic lodge whose stated purpose was to transform the State.
6)
https://en.wikipedia.org/wiki/Golpe_Borghese
Alleged fascist coup. A radio transmission was broadcast on December 8, 1970, warning the public that elements of the military had seized key objectives in the capital. Nothing happened afterwards.
7)
https://en.wikipedia.org/wiki/Itavia_Flight_870
A DC-9 passenger plane goes down in the Thyrrenian Sea. Italian officials say it was accidentally shot down during a dogfight between french and libyan planes.
8)
https://www.reuters.com/article/world/insight-missing-red-diary-at-heart-of-italys-dark-history-idUSBRE96O04C/
In the 1990s two top anti-mafia prosecutors are murdered in car bombing attacks. The personal journal of the second, a key item in the investigation, is found at the crime scene but mysteriously vanishes from the evidence pool and is never seen again.
9)
https://en.wikipedia.org/wiki/Strategy_of_tension