Question: What were the group of four perpetrators convicted for the crimes depicted in Il mostro di Firenze known as?

full_context: Document 1: Michigan murders: The Michigan Murders were a series of highly publicized killings of young women committed between 1967 and 1969 in the Ann Arbor/Ypsilanti area of Southeastern Michigan by an individual known as the Ypsilanti Ripper, the Michigan Murderer, and the Co-Ed Killer.
Document 2: Who Killed Pasolini?: Pasolini, un delitto italiano ("Pasolini, an Italian Crime"), internationally released as Who Killed Pasolini?, is a 1995 Italian crime-drama film co-written and directed by Marco Tullio Giordana. It depicts the trial against Pino Pelosi, who was charged with the murder of artist and filmmaker Pier Paolo Pasolini.
Document 3: Il mostro di Firenze (miniseries): Il mostro di Firenze (""The Monster of Florence"") is a 2009 Italian six parts mystery-drama television miniseries directed by Antonello Grimaldi. It depicts actual events surrounding the murders of the Monster of Florence and the investigation to discover his identity.
Document 4: Medici: Masters of Florence: Medici: Masters of Florence is an Italian-British television drama series about the Medici dynasty set in 15th-century Florence, starring Dustin Hoffman as Giovanni di Bicci de' Medici, Richard Madden as Cosimo de' Medici, and Stuart Martin as Lorenzo de' Medici ("The Elder"). The series was co-created by Frank Spotnitz ("The X-Files" and "Man in the High Castle") and Nicholas Meyer (""). Sergio Mimica-Gezzan ("The Pillars of the Earth") directed all eight episodes. Episodes 1 and 2 aired on Rai 1 (Italian TV) on 18 October 2016. According to Italian ratings compiler Auditel, it attracted a record 7.6 million viewers. The first season consists of eight episodes.
Document 5: Flat-Tire murders: The Flat-Tire murders refer to five connected, unsolved murders in Dade County, Florida in 1975. Investigators theorized that the killer deflated the tires of the victims' vehicles and offered them assistance before killing them. All the murders took place in the vicinity of Cutler Bay (known at the time of the killings, and until 2005, as Cutler Ridge) and the Palmetto area of South Miami-Dade County.
Document 6: Medici: Masters of Florence: Medici: Masters of Florence is an Italian-British television drama series about the Medici dynasty set in 15th-century Florence, starring Dustin Hoffman as Giovanni di Bicci de' Medici, Richard Madden as Cosimo de' Medici, and Stuart Martin as Lorenzo de' Medici ("The Elder"). The series was co-created by Frank Spotnitz ("The X-Files" and "Man in the High Castle") and Nicholas Meyer (""). Sergio Mimica-Gezzan ("The Pillars of the Earth") directed all eight episodes. Episodes 1 and 2 aired on Rai 1 (Italian TV) on 18 October 2016. According to Italian ratings compiler Auditel, it attracted a record 7.6 million viewers. The first season consists of eight episodes.
Document 7: Il mostro di Venezia: The Embalmer (or Il mostro di Venezia / "The Monster of Venice") is a 1965 Italian giallo directed by Dino Tavella that was filmed in Trieste and Venice. The film was released in the USA in 1966 as "The Embalmer" on a double feature with "The She Beast". It was released in the UK in 1972 as "The Monster of Venice", and in France in 1966 as "Novices Libertines". The film is patterned after the German crimi films in style and structure, and is also an early giallo. It contains many travelogue-type sequences designed to show off the beauty of Venice, obviously to pay off the Venice tourist department for their help.
Document 8: Aruba: The Tragic Untold Story of Natalee Holloway and Corruption in Paradise: Aruba: The Tragic Untold Story of Natalee Holloway and Corruption in Paradise
Document 9: 2006 Noida serial murders: The Noida serial murders (also Nithari serial murders, Nithari Kand) occurred in the house of businessman Moninder Singh Pandher in Nithari, India in 2005 and 2006. His servant Surinder Koli was convicted of the five murders and was sentenced to death. Eleven murders remain officially unsolved pending further legal proceedings. Surinder Koli's death sentence was changed to a life sentence by the Supreme Court on 7 September 2014.
Document 10: Monster of Florence: The Monster of Florence (Italian: Il Mostro di Firenze) is the name commonly used by the media in Italy for a series of eight double murder cases that took place between 1968 and 1985 in the province of Florence, Italy. Prosecution offices carried on several investigations into the cases for many years. The courts reached the conclusion that the murders were not committed by a single person but by a group of at least four perpetrators, who became later known as "the picknick comarades", and were definitively convicted. The 1968 murder was found to be a case unrelated to the others, albeit that the gun, that probably originally belonged to small local criminality, might be the same involved in the actual Monster cases.
Document 11: Texarkana Moonlight Murders: The Texarkana Moonlight Murders, a term coined by the news media, references the unsolved murders committed in and around Texarkana in the spring of 1946 by an unidentified serial killer known as the "Phantom Killer", or "Phantom Slayer". The killer is credited with attacking eight people within ten weeks, five of whom were killed. The attacks happened on weekends between February 22, 1946 and May 3, 1946. The first two victims, Jimmy Hollis and Mary Larey, survived. Some police officers are not sure if their attack was connected with the murders. The first double murder, which involved Richard Griffin and Polly Ann Moore, happened four weeks later. The second double-homicide, involving Paul Martin and Betty Jo Booker, occurred exactly three weeks from the first murders. The Texas Rangers came in to investigate, including the famous M. T. "Lone Wolf" Gonzaullas. Finally, almost exactly three weeks later, Virgil Starks was killed and his wife, Katie, was severely wounded. Most officials no longer connect that attack to the other murders. Contrary to popular belief, the killer did not attack during a full moon, but did strike late at night.
Document 12: Backpacker murders: The backpacker murders were a spate of serial killings that took place in New South Wales, Australia, between 1989 and 1993, committed by Ivan Milat. The bodies of seven missing young people aged 19 to 22 were discovered partially buried in the Belanglo State Forest, 15 km south west of the New South Wales town of Berrima. Five of the victims were foreign backpackers visiting Australia (three German, two British), and two were Australian travellers from Melbourne.
Document 13: Italian Unabomber: The Italian Unabomber is a name given by the international media to an unknown terrorist tied to a series of booby-trap bombings in northern Italy, specifically in the Veneto and Friuli-Venezia Giulia regions, which began in 1994. Italian law enforcement officials and the FBI believed that Unabomber is Elvo Zornitta, a 49-year-old engineer who has been charged with planting 20 bombs after police raided his home in August 2006. Though it is possible a group is behind the attacks, the prevailing assumption of the investigation and media reports is that one man is behind the crimes. Dubbed the Unabomber by the Italian media and correspondingly called the Italian Unabomber by the international press, the bomber is named after the American convicted murderer Theodore Kaczynski, referred to as the "Unabomber" during his criminal career. Kaczynski planted miniature bombs in mail packages sent to selected targets that killed three people and injured 23. Similar to Kaczynski, the Italian Unabomber hides bombs in everyday items, though never targeting anyone in particular. Instead, his bombs are set off by whoever happens to handle the booby-trapped object, including pens, candy containers and food jars. These objects are generally then placed in public places to await activation and are designed not to kill, but only to seriously injure a single person at short distance. Many of these devices are meant for small children using chocolate eggs, coloring markers, and bubble blowing tubes. Generally, the explosions severely injure limbs, hands, arms, faces and most of all eyes. Unlike Kaczynski, the attacker has made no political or economic demands. Several of his devices seem to have been planted in the "Continente" supermarket in the city of Portogruaro.
Document 14: Grim Sleeper: Grim Sleeper is the nickname for convicted serial killer Lonnie David Franklin Jr., responsible for at least ten murders and one attempted murder in Los Angeles, California. The attacker was dubbed the "Grim Sleeper" because he appeared to have taken a 14-year break from his crimes, from 1988 to 2002. In July 2010, Franklin was arrested as a suspect, and, after many delays, his trial began in February 2016. On May 5, 2016, the jury convicted him of killing nine women and one teenage girl. On June 6, 2016, the jury recommended the death sentence, and on August 10, 2016, Los Angeles Superior Court sentenced him to death for each of the ten victims named in the verdict.
Document 15: The Monster of Florence: A True Story: The Monster of Florence: A True Story is a 2008 true crime book by American thriller writer Douglas Preston and Italian journalist Mario Spezi. It relates to a series of murders that occurred between 1968 and 1985 and involved couples who were killed while having sex in their cars in deserted lanes around the city of Florence in the Italian region of Tuscany.
ground_truth: the picknick comarades