After the arrest of Mafia boss Totò Riina in January 1993, the remaining bosses, among them La Barbera, Giuseppe Graviano, Matteo Messina Denaro, Giovanni Brusca, Leoluca Bagarella, and Antonino Gioè, came together a few times (often in the Santa Flavia area in Bagheria, on an estate owned by the mafioso Leonardo Greco).
That resulted in a series of bomb attacks in 1993 in the Via dei Georgofili in Florence, in Via Palestro in Milan and in the Piazza San Giovanni in Laterano, and Via San Teodoro in Rome, which left 10 people dead and 93 injured as well as damage to centres of cultural heritage such as the Uffizi Gallery.
He followed Falcone's car as it sped toward Palermo, keeping in constant touch with Leoluca Bagarella, Antonino Gioè and Giovanni Brusca on the hillside near Capaci.
His father Girolamo La Barbera (born in 1925) was murdered on 10 June 1994, because he defended the choice of his son to become a pentito.
Although a key witness in several important trials underway, he had returned home and recommenced his criminal activities and avenged atrocities carried out on family members.