Question: What were the group of four perpetrators convicted for the crimes depicted in Il mostro di Firenze known as?
Sentence (from "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.
Relevant evidence: No