Episode dedicated to one of the most tragic events of Italy's "red biennium" (1919-1920): the Fascist assault on Palazzo D'Accursio in Bologna on November 21, 1920, where Fascist gangs shot and bombed the crowd, killing 10 and wounding 58; the event marks the irreversible crisis of socialism in Bologna and paves the way for the so-called "black biennium (1921-1922).