If by all powerful party you mean socialism then this is not correct.

No sane person should expect a single party with absolute rule to represent the people properly, which is exactly why current socialist states don't do this. Socialist states utilise policies that ensure the working class maintain power over the govenment. And the state must own the majority of companies instead of the capitalist class to ensure the capitalist class doesn't have power over the state.

Edit: Oh literally the meme states "dictatorship of the proletariat" and here I am explaining dictatorship of the proletariat. Do you understand what it means?