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Dorothy Day, Obl.S.B. (November 8, 1897 - November 29, 1980) was an American journalist, social activist, and Catholic convert. Day initially lived a bohemian lifestyle before gaining fame as a social activist after her conversion. She later became a key figure in the Catholic Worker Movement and earned a national reputation as a political radical, perhaps the most famous radical in American Catholic Church history.

Day encountered anarchism while studying in university. She read The Bomb by Frank Harris, a fictionalized biography of one of the Haymarket anarchists. She discussed anarchy and extreme poverty with Peter Kropotkin. After moving to New York, Day studied the anarchism of Emma Goldman and attended the Anarchists Ball at Webster Hall.  Day was saddened by the executions of the anarchists Sacco and Vanzetti in 1927. She wrote that when they died, "All the nation mourned." As a Catholic, she felt a sense of solidarity with them, specifically "the very sense of solidarity which made me gradually understand the doctrine of the Mystical Body of Christ whereby we are all members of one another."  Discussing the term anarchism, she wrote: "We ourselves have never hesitated to use the word. Some prefer personalism. But Peter Maurin came to me with Kropotkin in one pocket and St. Francis in the other!"  Day explained that anarchists accepted her as someone who shared the values of their movement "[b]ecause I have been behind bars in police stations, houses of detention, jails and prison farms, ... eleven times, and have refused to pay Federal income taxes and have never voted", but were puzzled by what they saw as her "Faith in the monolithic, authoritarian Church". She reversed the viewpoint and ignored their professions of atheism. She wrote: "I in turn, can see Christ in them even though they deny Him, because they are giving themselves to working for a better social order for the wretched of the earth."
Dorothy Day