Have a relative that was considered management at a major oil company in CA back in the 70's. He wasn't really management or a supervisor, but his professional status (engineer) had him salaried and non-union. The Teamsters went on strike, and after a week the company brought in independent truckers to deliver fuel from the tank farm to stations all over the Los Angeles basin - gas stations had no fuel!
Every trucker had a management member riding with them to document any incidents with the driver, with the striking workers (picketers) or with the public at large. He learned real fast that you don't mess with truckers: Leaving the tank farm on the first trip the armed guards and law enforcement opened the gate as the trucks approached, the picketers laid down on the sidewalk, and the driver put his foot on the floor. To this day my uncle has no idea how those picketers got up and out of the way so fast.
There was nearly a month of this, many trucks damaged or destroyed, and millions in property damage, but what few arrests there were there were no charges and no penalties. Hoffa has power!