A strong fascist sympathizer, with a bust of Benito Mussolini at home, through the propagandist actions for the Italian Social Movement (MSI) Giuseppucci was able to meet up with fellow neo-fascists such as Massimo Carminati, Alessandro Alibrandi and other members of the Nuclei Armati Rivoluzionari (NAR) group that he would later involve in the criminal projects for the Banda della Magliana.
There was a group, the Marsigliesi clan, led by Albert Bergamelli and Laudavino De Sanctis, that had started gaining considerable money through kidnappings and by first introducing small-scale drug trafficking.
Giuseppucci was also an avid gambler himself who regularly spent time at betting shops for horse racing, and used to lend the money acquired from robberies on usury, with interests ranging up to 20%/25%.
After 52 days, during which Giansanti had become sick, the hostage was freed but the ransom obtained was only 350 million lire, a far lower amount than the originally requested 5 billions, which had to be split in multiple parts due to the number of people involved in the kidnapping.
The organization operated under the principle of the "stecca para", which meant members obtained equal shares and lived off dividends gained from the criminal association.
The largest percentage of the gains however was kept in the "cassa comune", a common fund that was needed for anything that benefited the organization, be it for purchase of weapons or drugs, corruption of state figures, and so on.
Despite the organization being rather decentralized and allowing members to enjoy a good degree of independence, Giuseppucci virtually became the leader of the gang as he was the one to propose further operations and expansions.
Due to the inexperience in the kidnapping for most of the members and the difficulty in finding a safe location to keep the hostage, they asked for the help of a small gang from the Montespaccato area, who then hid the duke in the campanian countryside.
Selis and his group soon joined up with Giuseppucci and the others and became the main link between the Banda della Magliana and the Nuova Camorra Organizzata, which was the first supplier of drugs for the organization.
Not wanting to limit themselves to the drug trade however, Giuseppucci ordered the assassination of Franco Nicolini, a notorious bookmaker who had an effective monopoly on the betting shops in the city.
The Banda became more and more powerful, soon taking control of virtually the entire city's drug trade and gambling operations, by either employing or killing anybody who competed, as well as establishing close links with neo-fascist terrorist groups such as Nuclei Armati Rivoluzionari and Ordine Nuovo (mostly thanks to Giuseppucci who was a fascist himself), allying themselves with Cosa Nostra's main contact in Rome Pippo Calò, with Michele Zaza and other Nuova Famiglia camorristi through Claudio Sicilia, with 'Ndrangheta families through Gianfranco Urbani, and finally, enlisting the help of several criminals of the "old guard" who were active under the Marsigliesi, most importantly the powerful boss Danilo Abbruciati who entered the gang as soon as he exited jail in 1979.
Neo-fascist terrorists of the NAR were heavily involved in the waves of political violence of the time, and as they were associates in crime of Giuseppucci several of the weapons the two groups used were shared.
Giuseppucci was summoned for a meeting with DC politician Flaminio Piccoli in the outskirts of Rome, who requested Er Negro's help in finding Moro as he and his group had an extensive knowledge on the city's underworld.
Under Giuseppucci, the Banda della Magliana rose from being a small group of robbers to becoming a massive criminal organization that by this point effectively had a monopoly on all crime in Rome.
Er Negro was wounded fatally but immediately set the car in motion and drove to the nearest hospital, but once he arrived he died in the arms of the doctors just as they were about to intervene.