That's not a strike at all. That pure and simple sabotage of public infrastructure. The article links to a newspiece stating that the French union attacked a power distribution center. The union might try to pull the moral grandstanding card but pulling organized crime stunts just makes them an organized crime gang.
> You don't seem to understand what "class struggle" means.
Sabotaging public infrastructure because you throw a tantrum about how many temp workers a company hires in the Christmas holidays is not class struggle, it's just mob tactics and should be punished accordingly.