 He was also the first president of the São Paulo Archdiocesan Board of Catholic Action.Corrêa de Oliveira became concerned with what he saw as progressivist deviations within Brazilian Catholic Action, associated with the ideas of the French Catholic philosopher, Jacques Maritain and attacked these changes in his 1943 book, "In Defense of Catholic Action".With the arrival of a new archbishop in São Paulo in 1944, Corrêa de Oliveira lost his position as diocesan head of Catholic Action and in 1947 his directorship of the Catholic weekly "Legionário", which he had supervised since 1935.