Galasso was born in Poggiomarino, near Naples. Belonging to a well-endowed family – he studied medicine – he entered criminality when he killed two Camorristi who were trying to kidnap his brother (or asking him the pizzo). Once imprisoned at Poggioreale, he became acquainted with numerous Camorristi and knew Raffaele Cutolo.
He joined the Nuova Famiglia clan in the early 1980s and was soon protagonist of the bombing of Vincenzo Casillo, collaborator of Cutolo, the Nuova Famiglia's main rival. This murder is considered the beginning of the decline of Cutolo's Nuova Camorra Organizzata. During the war against the latter Galasso lost one brother.
Galasso's girlfriend was Florinda Mirabile, the daughter of Mario Mirabile, a Camorra clan boss. After her father's murder, she asked Galasso for help obtaining a gun to avenge the murder. He procured a precision shotgun for her, but the vendetta was never carried out. She would eventually turn state witness against the 'Ndrangheta in 1995, and receive a light sentence in return.
In 1992, he was arrested and, after a short period, became a pentito. Galasso confessed to over twenty murders and revealed the whereabouts of where the victims were buried. His revelations shocked Italy, when he mentioned high level members of Christian Democrat Party (then Italy's most important party) having links with the Camorra, such as the former Interior Minister Antonio Gava.
According to Galasso, the Camorra and politics were not separate worlds. Each Camorra clan had a 'prime political sponsor' and in common agreement politicians and criminal bosses would decide who should be elected to the principal political positions, who should obtain public contracts and which sites should be earmarked for construction.