Communism assumes people work in their best interests, and because ideas come from material environments and not from some idea of "spirit," Humans are more cooperative in cooperative systems and competitive in competitive systems.

A Communist leader is one that is democratically accountable and production is owned by the state, therefore all "profits" are reinvested into the economy for the benefit of all, rather than an elite few. Corruption is possible, yes, but so too is legislating protections against Corruption. In Capitalism, this corruption is required to function.