What specific horrible evils do you mean? And how do you attribute them to, specifically, organizing an economy along communistic lines?
I ask because if we can take a country with a communist economy, or striving for one, and blame all its evils on communism itself, I have a few things I'd like to point out as being the horrors of capitalism:
1. Atlantic slave trade - millions dead (many on the ships), millions enslaved
2. Settler colonialism and indigenous genocide - British empire, all over the world
3. Congo Free State, Leopold II - 1 to 5 million dead via colonial extraction regime
4. British India famines - 3 million dead
5. Irish Famine - 1 million dead
6. Opium wars - directly caused by British using the military to defend market access. 100k dead, devastating to Qing China for a century
7. Indonesian anti-communist massacres - 500k-1mil alleged "communists" killed after the USA, UK, and Australian intelligence agencies propagandized against them
This is important and rarely discussed. I'd add that there's a larger pattern tying these cases together, one that also speaks to some of the Encyclical's broader points: whether it's the Politburo of the USSR, the Court of Directors of the East India Company, or the Board of the United Fruit Company, historical atrocities in any age, society, or economic system almost always occur in the context of enormous power concentrated in few hands. It isn't capitalism or communism but the absence of accountability.
> What specific horrible evils do you mean?
The 1956 student massacres in Hungary, where my grandma was almost killed. The Holodomor, the various "Russianization" campaigns, the Jewish Autonomous Oblast, The Great Leap Forward, etc.
The specific evil in my mind was the Great Leap Forward, but there are dozens we could draw from history.
And I attribute them to communism because that's literally how history attributes them, though obviously pro-Communism thinkers would disagree.