Pope John XXIII canonized Martin de Porres on May 6, 1962. Catholic News Agency has published an article marking the 50th anniversary of the event here. It mentions something I wasn’t aware of: that Martin is a patron saint of works for social justice.
The part that struck me as interesting is that the article mentions that Pope Pius XII bestowed that title upon him in 1945. (That’s also mentioned here and a few other places in the web, too.) But Martin had not yet been canonized at that point (he’d been beatified in 1837), and canonization would not come for almost two more decades after Pius’s act. It says a lot for the popular devotion to Martin that existed that Pius XII named him a “patron saint” of something when he was not yet, officially, even a saint.
St. Martin de Porres, patron of our works for social justice, pray for us!