By John Clark, National Catholic Register - One would be hard-pressed to find an error that has been condemned more often, more strongly, by more popes, for more serious reasons, than socialism... Recently in "America" magazine, there appeared an article titled, “Yes, democratic socialism is compatible with Catholic social teaching.” While it may be exasperating to see pro-socialism columns like these appear again and again, it’s not surprising. As it turns out, the core philosophy we now call “socialism” has been one of the most persistent errors in Church history... While the word “socialism” only found its way into common parlance in the 19th century, its underlying philosophy dates back several millennia.