Girolamo Piromalli (October 7, 1918 – February 11, 1979), also known as Mommo, was an Italian mobster and member of the 'Ndrangheta. He was capobastone (head of command) of the Piromalli 'ndrina based in his home town Gioia Tauro on the Tyrrhenian coast of Calabria.

'Ndrangheta boss

Mommo Piromalli ruled the most powerful 'Ndrangheta group in the Gioia Tauro plain with his younger brother Giuseppe "Peppe" Piromalli. The Piromalli 'Ndrina contained more than 200 members.

Girolamo Piromalli

Before becoming one of the most feared criminal power brokers in the Gioia Tauro plain, Mommo Piromalli was a cowherd. In 1939 he was charged with illegal carriage of firearms, in 1940 for grievous bodily harm, in 1944 for robbery with violence and in 1950 for murder. In 1967, the court imposed a five-year mandatory internal banishment (soggiorno obbligato) to remove Piromalli from his home town and criminal associates.

Girolamo Piromalli

Together with Antonio Macrì from Siderno on the Ionic coast and Domenico Mico Tripodo, the boss of the city of Reggio Calabria and the surrounding areas, the Piromalli brothers formed a sort of triumvirate since the beginning of the 1960s until the outbreak of the First 'Ndrangheta war in the mid 1970s. Their senior position was recognized by all other heads of 'Ndrangheta families and their advice was in most cases followed without protest.

Girolamo Piromalli

Establishing the Santa

Mommo Piromalli and the bosses of several other families established La Santa at the end of the 1960s. In the same time, he was initiated in the Italian Freemasonry.

They were eager to modify the traditional rules of the 'Ndrangheta in order to be able to get access to contracts for public works in the region and start illegal activities such as drug trafficking, which were prohibited by the traditional code but promised to be very profitable. Through the membership of covert Masonic lodges the 'Ndrangheta bosses were able to contact law enforcement authorities, judges and politicians that were necessary to access to public work contracts.

According to Gaetano Costa (the former chief of the Messina Mafia family turned state witness), "it was Mommo Piromalli who – given the enormous interests which the existed in the Reggio Calabria area (the railroad stump, the steelwork center, and the port in Gioia Tauro, etc.) – entrusted himself with the rank of santista, in order to assert his higher authority and hence directly control the public works. He said that this rank had been given him directly in Toronto, where there was a very important 'ndrina."

These innovations and the new institution of La Santa were opposed by the more traditionalist bosses such as Antonio Macrì and Domenico Tripodo. Only at the end of the so-called First 'Ndrangheta war, which took place in 1974-76 and led to the deaths of Macrì and Tripodo as well as the rise of Piromalli and the De Stefano brothers as the new leaders of the Reggio Calabria 'ndrine, was the new institution fully recognized.

In 1973, Piromalli was charged of heroin trafficking when an undercover operation by the US Federal Bureau of Narcotics (FBN) targeting Saverio Mammoliti revealed that Mammoliti needed permission of Macrì and "Don Mommo" Piromalli.

Getty kidnap

Piromalli was one of the men charged with the kidnap of John Paul Getty III on July 10, 1973, in Rome. The ransom initially demanded was $17 million (equivalent to $ in ) for his safe return. However, the family suspected a ploy by the rebellious teenager to extract money from his miserly grandfather. John Paul Getty Jr. asked his father J. Paul Getty for the money, but was refused, arguing that his 13 other grandchildren could also become kidnap targets if he paid.

In November 1973, an envelope containing a lock of hair and a human ear arrived at a daily newspaper. The second demand had been delayed three weeks by an Italian postal strike. The demand threatened that Paul would be further mutilated unless the victims paid $3.2 million. The demand stated "This is Paul's ear. If we don't get some money within 10 days, then the other ear will arrive. In other words, he will arrive in little bits."

When the kidnappers finally reduced their demands to $3 million, Getty agreed to pay no more than $2.2 million (equivalent to $ in ), the maximum that would be tax-deductible. He lent his son the remaining $800,000 at four percent interest. Getty's grandson was found alive on December 15, 1973, in a Lauria filling station, in the province of Potenza, shortly after the ransom was paid.