Earlier quoted context omitted.
Abuse of the workforce didn't start in 1940 and end in 1979. Some labor innovations you may enjoy: - Weekends (40 hour week) - Minimum wage - No child labor - Workers compensation - Not being massacred by your employer¹ Don't be so glib about the necessity of unions -- the Fair Labor Standards Act was written with blood. ¹ See, e.g. , the Ludlow Massacre, the Thibodaux Massacre, Battle of Blair Mountain.
There is poor evidence to support your points. And what about Switzerland that has very low union membership, have pretty much 40 hours weeks, no child labor, and the highest compensation across Europe despite having no minimum wage? It does not add up if we follow your narrative.
You can't take something that works in Switzerland out of that context and then apply it to some other country with the arguement 'it works in Switzerland'.