From the outset, the Soviet Communists declared the abolition of state and classes as their ultimate objective. But it never happened. Ruling the nation without a state turned out to be impractical from day one.
A Communist revolution per definition is a very violent project, with exploitative classes resisting the arrival of new world to their dying breath. That means a dire need of police, secret police, spies, firing squads, army, navy, the full monty. All these things are the trappings of State.
As the North Korea clearly shows, even several generations after the bourgeois classes in your country had been eradicated, you can’t do without state.
Now, to the classes.
In theory, as soon as you nationalize and collectivize everything, as we did in the USSR, classes in their Marxist definition cease to exist. Somehow, in the Soviet Union, it didn’t happen!
Due to some obscure perfectionist quirk of our Communist scholars, we held to the view that collective farmers had collective rights of ownership to their land and equipment. Workers as a class didn’t have comparable ownership rights to their machines and tools. That means we continued to have two classes, and no one said when this was expected to end.
In addition, we had “a layer” (as opposed to “class”) of “working intelligentsia” who didn’t work manually as prescribed by old-school Marxists, yet anyhow had the right to exist in the new society.
This is what these guys looked like, during the late-era Soviet Union:
The suit to the right is obviously the “layer” person. A badge on his lapel has hammer and sickle in it to prove his office work is no better than toiling in the fields or at the steel furnace. The macho guy in the middle impersonates the leading role workers as a class were assigned in the Soviet Union.