And communism has succeeded in that wherever it’s been tried: in Cambodia food consumption went down by about 25%. In Russia and China multiple famines took place.
"ProleWiki is a collaborative Marxist-Leninist project aiming to build an anti-imperialist communist encyclopedia with information on current events, communist"
A open source with a political bent isn't a proper citation on the source they openly support, but even then, our own source points to human factors.
At least ProleWiki doesn't hide its bias. Your sources, on the other hand, claim to be "unbiased", when, in reality, there is no such thing as unbiased news.
Really on facts and not trying to mislead. Every source will have some biases and maybe different facts, and even main stream sources often try to mislead with loaded language and ignoring facts that don't fit with what they want to to think.