Roman historians wrote about Jesus (Tacitus), also the Jewish historian Flavius Josephus. We can argue about his divinity (I am a believer) but I don't think we can argue about his existence.
There were others but they are further in time so they may be quoting those two.
If anything socialism is Christianism since that's what Jesus taught, not socialism.
Anyway Pope Leo XIII explained it better in the Rerum novarum (distributism not socialism), maybe an Anarchist (on Earth) because there is no ruler but Him, no government but God's.
That was in 1812, after than we went back to Monarchy with the infamous Fernando VII, then Isabel II, then Alfonso XII, Alfonso XIII then dictatorship then democracy (1978).
And that's one of their best UI. You understand everything with a single glance, no need to press shift to get more things, there are no more things, that's all there is.
Roman historians wrote about Jesus (Tacitus), also the Jewish historian Flavius Josephus. We can argue about his divinity (I am a believer) but I don't think we can argue about his existence.
There were others but they are further in time so they may be quoting those two.