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. His two children, Stefano and Virgilio (8 and 22 years old) were burned alive. 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 most serious demonstration occurred on February 28, 1975 when demonstrators from the left and right clashed outside the court after the arrival of Achille Lollo accompanied by two
carabinieri at approximately 9:15AM. At noon the court interrupts the meeting, at which point the fascists organize to leave. The situation escalates when police in
riot gear surrounded the courthouse and began removing protestors from the area surrounding Ottaviano Street. At 13:15 a large group of leftists gathered outside the court and attempt to storm the building through the main entrance. Michallis, Lollo and the few still present in the building attempted to escape through the side door but were quickly spotted by right-wing demonstrators as they attempted to flee. During the foray, Mantakas was assassinated by
Alvaro Lojacono who had attended the protests as a member of Potere Operaio. Mantakas, unconscious but still alive was carried by his partners into the office where they waited for aid. He would later be transferred to Spiritus Santos hospital where he underwent several
blood transfusions. 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..". Despite being rushed to hospital, the severity of Mantakas' injuries were eventually too much and at approximately 6:30 PM Mantakas was
pronounced dead. As a result of the fighting, 22 people were wounded by gunfire. ==Reactions==