The early church practised communal property. Augustine and Turtullian preached self-abnegation, self-denial, and self-renunciation in terms that were later mimicked by secular socialists in the modern age.
In the Middle Ages, the church ruled a society in which commerce, trade, prices were all highly regulated, in a system that could be described as draconian control of economic activity. It was a church-enforced socialist system, with barons and feudal lords taking the exact same role as commissars later took under non-Christian versions of the same sorts of practices. The medieval guilds were the strictest form of unionism and control of labor practises.
During this time lending money was evil, interest rates were evil, and the Christian Ethic was deeply tied to all sorts of rules and regulations of what is good economics and what is bad. The German Kings routinely used these rules to cheat the Jews --- who because they couldn't own land ended up lending money, and thus became the villains of the age, all according to Christian doctrine.
Feudalism was an institutionalized form of crude socialism, where the bosses preached that your lot in life was God's will and the Christian ethic was one of bare subsistence living and servitude to the greater good.
The Medieval Fairs, which were a liberalization of economics, ran counter to church doctrine.
Oh, I was thinking about what the Bible teaches.