>Communism, no matter its form, only leads to slavery and poverty.
This statement is at best unprovable and at worst meaningless. Communism is a theoretical form of economic/social organization (like capitalism) and has never been purely implemented (like capitalism). The aim of communism is to create a completely classless society in which private ownership is not a thing, i.e. the concept of slavery wouldn't make sense, impossible by definition. Unless you have a society without stratification, you do not have a communist society.
You should revise your statement to something like "some societies partially implemented elements of a communist philosophy and ended up impoverished, with some members of said society ending up enslaved".
This statement is at best unprovable and at worst meaningless. Communism is a theoretical form of economic/social organization (like capitalism) and has never been purely implemented (like capitalism). The aim of communism is to create a completely classless society in which private ownership is not a thing, i.e. the concept of slavery wouldn't make sense, impossible by definition. Unless you have a society without stratification, you do not have a communist society.
You should revise your statement to something like "some societies partially implemented elements of a communist philosophy and ended up impoverished, with some members of said society ending up enslaved".