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

Context paragraphs:
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.

The Assassin of Rome: The Assassin of Rome (Italian: "Girolimoni, il mostro di Roma" ) is a 1972 Italian historical drama film directed by Damiano Damiani.  The film tells, with some historical licenses, the story of Gino Girolimoni, wrongfully accused of a series of child murders that occurred in Rome between 1924 and 1928.

Ente Cassa di Risparmio di Firenze: Ente Cassa di Risparmio di Firenze is a foundation originated from Cassa di Risparmio di Firenze.  The foundation was the minority shareholders of Banca CR Firenze S.p.A. (until 2015) as well as the 5th largest shareholders of Intesa Sanpaolo, for 2.615% (414,655,221 as of 31 December 2015, a net increase from 410,855,221 at 31 December 2014).  As of 31 December 2014 the "ente" also owned 14% of Aeroporto di Firenze, which became part of Toscana Aeroporti in 2015.

Banca CR Firenze: Banca Cassa di Risparmio di Firenze S.p.A. known as Banca CR Firenze, is an Italian bank.  Once a listed company, the group now part of Intesa Sanpaolo since 2007.

Silviatti: Silviatti is a proper Italian surname, originating in the Arno Valley region of Tuscany.  The first references to the Silviatti family are in a 1225 census report taken by the town fathers of Sesto di Firenze.  They are listed as 'bankers' or 'money-changers' depending upon interpretation of the dialect.  Prominent members of the family include Giacopo Silviatti, a majordomo in the house of Lorenzo de' Medici, and Gianfranco Silviatti, an acting mayor of Sesto di Firenze in the 16th century.

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.

Firenze Rifredi railway station: Firenze Rifredi railway station, or Florence Rifredi railway station (Italian: "Stazione di Firenze Rifredi" ), serves the city and "comune" of Florence, in the region of Tuscany, central Italy.  It is the third most important railway station in Florence, after Firenze Santa Maria Novella and Firenze Campo di Marte.  It also forms part of the traditional Bologna–Florence railway, and the railways linking Florence with Viareggio, and Pisa and Livorno, respectively.

La Specola: The Museum of Zoology and Natural History, best known as La Specola, is an eclectic natural history museum in Florence, central Italy, located next to the Pitti Palace.  The name "Specola" means observatory, a reference to the astronomical observatory founded there in 1790.  It now forms part of the Museo di Storia Naturale di Firenze.  This museum is part of what are now six different collections at four different sites for the Museo di Storia Naturale di Firenze.

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.

The Monster of Frankenstein (film): The Monster of Frankenstein (Italian:Il mostro di Frankenstein) is a 1920 Italian silent horror film, directed by Eugenio Testa, starring Luciano Albertini, Aldo Mezzanotte and Umberto Guarracino, and is an adaptation of Mary Shelley's novel "Frankenstein".

Supporting paragraphs: Il mostro di Firenze (miniseries) Monster of Florence
Answer: the picknick comarades