On 16 April 1973, the home of Mario Mattei and secretary to the local right-wing party MSI was set ablaze in an incident that would later come to be known as The Primavalle fire.
[1] On 7 May, 1973, the prosecutor identified three members of Potere Operaio as perpetrators, Achille Lollo, Marino Clavo, and Manlio Grillo.
As a result, numerous demonstrations by left-wing groups in Italy were held protesting the indictments and further escalating tensions and eventuating in violence after the trial began on February 24, 1975.
The newspaper Makedonia reported the doctor in charge of Mantakas' surgery as stating "The projectile entered the left area of the parietal bone and crossed the entire skull..".
[4] Alvaro Lojacono, a member of the Italian Communists (and later the Red Brigades) was identified as the killer and sentenced in absencia to 16 years jail time.
[5][better source needed] Political unrest in Italy followed the murder of Mandakas, resulting in the creation of an armed branch Nuclei Armati Rivoluzionari (NAR) of former members of the MSI.