Er...

https://en.wikipedia.org/wiki/Withering_away_of_the_state

Although Engels first introduced the idea of the withering of the state, he attributed the underlying concept to Karl Marx; other Marxist theorists — including Vladimir Lenin — would later expand on it.[1][3] According to this concept[which?], eventually a communist society will no longer require coercion to induce individuals to behave in a way that benefits the society.[1][2] Such a society would occur after a temporary period of the dictatorship of the proletariat.[2]

It proceeds from the concept of the transformation of the state in the previous stage of society called socialism. In socialism, Engels posits that, similar to the arguments made by Henri de Saint-Simon before him, that in a socialist society public organization would become primarily concerned with technical issues such as the optimal allocation of resources and determination of production as opposed to drafting and enforcing laws, and thus the traditional state functions would gradually become irrelevant and unnecessary for the functioning of society. Engels argued that the state transforms itself from a "government of people, but the administration of things", and thus would not be a state in the traditional sense of the term.

This scenario depended on Marx's view of coercive power as a tool of those who own the means of production, i.e. certain social classes (the bourgeoisie) and the capitalist state.[2][3] In a communist society the social classes would disappear and the means of production would have no single owner; hence, such a stateless society will no longer require law, and stateless communist society will develop.[1][2][3][5]

Socialist movements and the socialist mode of production can be confusing. What do you think class is, if not the relationship of exploitation of one group of people by another?

I think it's this: https://en.wikipedia.org/wiki/Class_%28social%29