It's a branch of socialism, allegedly a higher order of socialism. The fundamentals of both are actually good, the working classes were supposed to be elevated so that everyone would be equal and there wouldn't be ruling classes. And with communism the people did become equal, the upper class, middle class and working class became equally skint, equally voiceless and equally powerless.
So the workers didn't have to kiss the arse of the bourgeoisie anymore, so on that front job done. Unfortunately everybody did had to live under the totalitarian rule of the communist party, democracy, freedom of speech and free will were seen as threats to the system so were banned, any dissent generally resulted in a one way ticket to a gulag or perhaps miss out on the gulag and just get fucked in a hole in the ground!
In the end it was actually the opposite of what Marx had envisaged, instead of making everyone equal by raising the working class up, everyone was made equal by pulling everyone down and instead of creating a society without an upper class the communist parties of the world took over from the upper classes in that they had total control and power over everything.
Careful Lubo this could actually turn into a political thread instead of a group of people shouting yes at each other!