“Christian socialism”
A contradiction-in-terms.
“If, like all errors,socialism contains a certain element of truth (and this the Sovereign Pontiffs have never denied), it is nevertheless founded upon a doctrine of human society peculiarly its own, which is opposed to true Christianity. Religious socialism, Christian socialism, are expressions implying a contradiction in terms. No one can be at the same time a sincere Catholic and a socialist properly so called.”
~~ Quadragesimo Anno, Encyclical Letter of Pope Pius XI