But, they never really reach the communist stage, because before they achieve the so-called "dictatorship of the proletariat" they end up ruining the nation. They generally begin to increase public spending and to indebt the state, raise taxes or devalue the currency, one of the two, all to finance the populace, which quickly becomes addicted to state subsidies. when the bureaucracy and the desidia come, they end up killing the productive apparatus, and when they run out of capital, boom! the collapse.