By Francesca Pollio Fenton, CNA Staff - ..the feast of St. Joseph the Worker... While the saint’s March feast dates back to the 10th century, his May feast wasn’t instituted until 1955. What was behind it?... Pope Pius XII instituted the feast of St. Joseph the Worker on May 1, 1955 so that it would coincide with International Workers Day, also known as May Day — a secular celebration of labor and workers’ rights. During this time, the Soviet Union proclaimed themselves as the defender of workers and utilized May Day as an opportunity to exalt Communism and parade its military prowess. Pope Pius XII chose the date specifically to ensure that workers did not lose the Christian understanding of work.