In theory, full communism prevents corruption by removing its structural causes rather than relying on laws or moral exhortation. And since corruption under capitalism (in Marxist analysis) stems from private ownership, class divisions, and the scramble for scarce resources, abolishing those conditions should eliminate the incentives that drive people to exploit positions of power for personal gain. Without private property to accumulate or a state apparatus to capture, the reasoning goes, there would simply be nothing left to be corrupt about.
