May 1st in Communist world is ‘International Workers’ Day’, even if in Marx’s disordered view, ‘work’ is a commodity to be used by the ‘state’, to which man is subordinate. For all their talk of the ‘working ‘man’, communist regimes believe far more in slavery than in human dignity.
It was to combat the errors of Communism, particularly their erroneous view of human labour, that Pope Pius XII instituted this feast in 1955, alongside Saint Joseph’s principal feast day on March 19th.
Workers of the world should unite, but around the true principle of work:  Not as a materialistic endeavour, whose sole