The reasons for discontent varied - while the usual pay and conditions were a factor, it's fair to say that tensions were increased by the fact that much of the workforce had migrated from the much poorer south. They were generally unhappy at the society that had forced them to leave their homes in search of work and wanted to get back at the employers that had exploited the low average wages for so many years.
The phrase "hot autumn" has since been applied in the Italian press to describe other autumns with significant amounts of strikes. In the later years, such season strikes have more often been directed against the government's budget.