COMMENTARY: For the best model for workers, look not to a man named Marx but to a carpenter named Joseph.The Childhood of Jesus. (photo: Gerard van Honthorst / Web Gallery of Art) May Day has all sorts of historically varied meanings and traditions among various groups, including Catholics. Since the late 19th century, however, May 1 has been particularly known for its association with workers — particularly, its appropriation if not exploitation by socialists and communists. That began in earnest on May 1, 1889, when socialists launched International Workers’ Day. “May 1st is May Day, the International Workers’ Holiday,” explains...