There can be no checks and balances on a state.

States only act in a way to preserve themselves. If that means by helping the working class - so be it. If it means oppressing the working class - that’s ok too. As long as the structure and elites remain in place.

Which is why authoritarian state communism always degenerates into a kind of state capitalism where the owner class is the state instead of capitalists. In communism there is no owner class