As early as 1878, Pope Leo XIII's encyclical Quod Apostolici Muneris
strongly denounced Socialism--however Christian--on the grounds that it opposed the natural institutions of authority and property, preferring to substitute forcible governmental distribution of goods for charity.
The Thomistic view of the universe as an ordered hierarchy of being can be found in Leo's encyclical, Quod Apostolici Muneris
("On the Evils of Socialism," 1878) where he attacks the socialist belief in the absolute equality of all men and contrasts it with "the true equality of the Gospel.
Such legislation is merely the natural outgrowth of the socialist mindset, which Pope Leo XIII warned against in Quod Apostolici Muneris
, his encyclical of 1878.
Leo XIII, who succeeded Pius in 1878, shared his predecessor's evaluation of the contemporary world, as is clear from his second encyclical, Quod Apostolici Muneris
(1878): "The revered majesty and power of kings have won such fierce hatred from these seditious people that disloyal traitors .