> Perhaps it's a contributing factor to the long stagnation of the Italian economy

Perhaps.

But doesn't explain stagnation in Japanese economy where there are no Italian unions.

Or why France did much better despite having even stronger work protections laws than Italy and wilder strikes (the gilet jaunes for example) or those happened last year against the pension reform where the workers of public transportation went on strike - for weeks - without even announcing it.

Even countries like Germany, Singapore, Switzerland and Finland are doing worse than Pakistan in the GDP growth race.

My point was than if there are stronger work protection laws somewhere else and the laws of your country are weaker, they are not very strong, they are moderately strong.