It’s clear while looking at what the CPC is doing that it is working towards the benefit of the working class, but I still have not fully grasped the structural and theoretical reason for why the party represents the working class.

Like, I can see that capitalists don’t have much foothold in the party, and corruption is low, but why? Is there something that stops capitalists from climbing the ranks?

Many western ‘socialists’ also like to claim that party elites have become the new ruling class. But really, what is there to stop the party elites from working for their own benefit?

Basically: How is the top level of the party still held accountable to the wants of the working class?