His social encyclical, Quadragesimo Anno {Forty Years After), continuing the ground-breaking social policies of Leo XIII in Rerum Novarum, demanded the end of social inequalities while providing bases for fair working conditions and a just living wage for employees.
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He openly criticized certain papal periodicals and encyclicals, including Rerum Novarum (Leo XIII), Quadragesimo Anno (Pius XI), and Divini Redemptoris (Pius XI).
Briefs had an impact on the social teachings of the Catholic Church and was considered a ghost writer of the encyclical Quadragesimo Anno of Pope Pius XI with his friend, the Jesuit Gustav Gundlach, with whom he spent his annual Summer vacations together.
He took as the basis for his Catholicism bot the works of Thomas Aquinas and the Papal encyclicals Rerum Novarum and Quadragesimo Anno, contrasting them with his twin political hates of liberalism and communism.