Yeah no if you’re calling the Khmer Rouge, whom authoritarian communist, Ho Chi Minh, kicked out and the US armed and supported in exile until the 90s, an example of leftists, no shit you’ll get banned, clearly you’re not there to have an actual discussion.

As far as the USSR and Mao, communist circles tend to have much deeper understanding and criticisms of these things because we actually engage with what actually happened, why it happened, it’s effects, how it’s perceived by modern historians, etc, as opposed to liberals who don’t actually care beyond its utility in jerking off while grunting “communism bad”.