Another questionable act of Pius XII, instituting this feast on Communist “May Day” (the high holy day of communists).

He sought to speak highly of labor, to win their sympathies.

Today, the breviary speaks of labor being sanctified (not of us sanctifying our labors, but as though labor already  possessed this intrinsic quality):

Labor is holy?

That would be a very grave error.

From an article by Fr. Cekada: http://www.traditionalmass.org/articles/article.php?id=37&catname=6

[Because of the confusing format and use of quotation marks, it is not clear to me whether he is citing Fr. Didier Bonneterre SSPX, author of Liturgical Revolution, or Jean Crete]:

"The Sacred Congregation of Rites was not favorable toward this decree, the work of a special commission. When, five weeks later, Pius XII announced the feast of St. Joseph the Worker (which caused the ancient feast of Ss. Philip and James to be transferred, and which replaced the Solemnity of St Joseph, Patron of the Church), there was open opposition to it.

“For more than a year the Sacred Congregation of Rites refused to compose the office and Mass for the new feast. Many interventions of the pope were necessary before the Congregation of Rites agreed, against their will, to publish the office in 1956 — an office so badly composed that one might suspect it had been deliberately sabotaged. And it was only in 1960 that the melodies of the Mass and office were composed — melodies based on models of the worst taste.

"We relate this little-known episode to give an idea of the violence of the reaction to the first liturgical reforms of Pius XII".

Isn't this essentially the ideology Jose Maria Escriva and Opus Dei?

I love St Joseph also.