When Pope Francis addressed the U.S. Congress on September 28, 2015, Dorothy Day was one of four great Americans he recommended to the lawmakers. Dorothy identified with those marginalized by American capitalism. With St. Paul, she considered herself a fool for Christ’s sake. She attacked poverty by preaching voluntary poverty. She opposed any use of religion as a prop for U.S. nationalism, capitalism, or militarism. Her words and life summed up the best of 20th-Century Catholicism. Hers is a prophetic voice for people of conscience in our day.