Everyone agrees the middle-class peaked around 1970. It just so happens that of the 60 million households in 1968, approximately 30 million workers collected paychecks from the government or unions. Add to this this those working on government contracts and state and local government jobs, and the vast majority of all employees were unionized or on the government payroll.
And life was good.
Today, there are about 123 million households totalling less than 20 million union and government employees (less than 15 percent).
And life is hard.
Big unions and big government are clearly the best thing possible for the working classes. The numbers speak for themselves. Letting "the markets" decide has been disastorous for the working classes.