Luca Perucci was an activist with the neofascist Terza Posizione (Third Position) group. On January 6th, 1981, he was murdered by members of the Nuclei Armati Rivoluzionari. The NAR were, themeselves, neofascists. They killed Luca because he knew too much about the Bologna train station bombing the NAR had committed.
The lesson is a simple one that we keep coming back to over and over: when you know about fascist murders, you should report them to the authorities. Not merely for moral reasons, but for the simple fact that if the cops ALREADY KNOW what the fash did, the fash have nothing to gain by killing you.