Quadragesimo Anno (Latin for “In the 40th Year”) is an encyclical written by Pope Pius XI, issued 15 May 1931, 40 years after Leo XIII's Rerum Novarum. Unlike Leo XIII, who addressed the condition of workers, Pius XI discusses the ethical implications of the social and economic order. He describes the major dangers for human freedom and dignity arising from unrestrained capitalism and totalitarian communism. He also calls for the reconstruction of the social order based on the principle of solidarity and subsidiarity.
Read more about Quadragesimo Anno: Changes Since Rerum Novarum, Private Property, Capital and Labour, Social Order, Communism and Socialism, Corporatism and Fascism