Communism and Fascism are the two extreme ends of political spectrum,
in both cases, where the regimes dictatorial nature exerts centralised control over their citizens, you can expect these authoritarian states to commit atrocities on continuous basis.
Communism and fascism
always come together in a marriage of convenience, because they have shared common principles - oppression, persecution, authoritarianism, tyranny, death, destruction, mass-murder, ethnic cleansing, genocide etc.
Commies and fascist-Nazis always become bedfellows in their diabolical quest to destroy free nations & peoples.
The Molotov-Ribbentrop Pact or Hitler-Stalin Pact is just one example of the evils of Nazism and communism closing ranks to invade, occupy, divide the free nation of Poland between themselves and commit genocide on the Polish people.
The "limitless friendship" between genocidal mass-murderers Poo-tin and Xi is another example of fascist-Nazi-imperialist scum and commie filth coming together.
Another fine example is the horde of useful idiots of Poo-tin in the free countries. The sadist horde overtly and covertly celebrating and cheering on Poo-tin's genocide of Ukrainians all happen to be either fascist-Nazi scum who idolise their favourite new symbol Z or commie filth who carry the bloody Red flag of the long-dead evil empire (USSR).
The only silver lining is that the fascist-Nazis and commies soon break their pact, attack each other and try to destroy each other. This happened with Hitler and Stalin, and is bound to happen with Poo-tin and Xi sooner or later.
The sadist horde overtly and covertly celebrating Poo-tin's genocide together now will also start attacking each other soon as they get split into opposing fascist-Nazi and commie camps. It would be fun to watch these barbaric cheerleaders of Poo-tin's genocide tear each other apart like the rabid dogs they all happen to be!