To apply the marxist theory,some political organization will need to get more powerfull and influential than:
1-Small,Medium and Large business.
2-Government.
3-Military.
4-Religious institutions.
To perform a communist revolution there needs to a deep cultural dissemination,the communists need to be in key positions of power and the people need to be claiming for it.Marxism preaches for a centralizing government that distributes all wealth.Centralization of economical,political,military and cultural party in a hand of a few is a recipe for dictatorship.History proves this.China and Russia have "capitalist economies" and yet they are still dictatorships.
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https://en.wikipedia.org/wiki/Mass_killings_under_communist_regimes
Way too many genocides to just be a "policy mistake".Communism is genocidal by its nature.