The most definitive article to date: Vatican: Pope Didn't Invite Bernie Sanders

[DemonGoddess]

30. just a part

His words deserve to be re-read attentively: "To remedy these wrongs (the unjust distribution of wealth and the poverty of the workers), the Socialists encourage the poor man's envy of the rich and strive to do away with private property, contending that individual possessions should become the common property of all...; but their contentions are so clearly powerless to end the controversy that, were they carried into effect, the working man himself would be among the first to suffer. They are moreover emphatically unjust, for they would rob the lawful possessor, distort the functions of the State, and create utter confusion in the community".39 The evils caused by the setting up of this type of socialism as a State system — what would later be called "Real Socialism" — could not be better expressed.

So, basically, from what I'm reading already, the encyclical referenced is against Socialism, and of course atheism (this part I would always expect, given it's coming from a Pope).