In December , four bombings struck the Monument of Vittorio Emanuele II in Rome ( '' Altare della Patria '' ) , the '' Banca Nazionale del Lavoro '' , and in Milan the '' Banca Commerciale '' and the '' Banca Nazionale dell ' Agricoltura '' . The later bombing , known as the Piazza Fontana bombing of 12 December 1969 , killed 16 and injured 90
Piazza Fontana bombing
Piazza Fontana bombing
1972 Italian general election