The fourth Commission was installed on June 8, 1992, after the murder of judge Giovanni Falcone on May 23 and was modified after the killing of his colleague Paolo Borsellino on July 19. On September 23, Luciano Violante from the Democratic Party of the Left (Partito democratico della Sinistra, PDS) was appointed president of the Commission. Under Violante’s leadership the Commission worked for 17 months until the dissolution of Parliament in February 1994. It passed 13 reports, but its most important one was on the relations between the Mafia and politics, the so-called "terzo livello" (third level) of the Mafia, on April 6, 1993.