For a three-act plot analysis, put on your screenwriter’s hat. Moviemakers know the formula well: at the end of Act One, the main character is drawn in completely to a conflict. During Act Two, she is farthest away from her goals. At the end of Act Three, the story is resolved.
Act I
Feudalism collapses; the bourgeoisie becomes the most powerful class, and the aristocracy fades away. But the bourgeoisie is oppressing the proletariat (the workers). The workers begin rebelling.
Act II
The workers band together in groups that are larger and larger and more and more powerful. Eventually, the time comes for violent revolution.
Act III
The proletariat overthrows the bourgeoisie and establishes a temporary or "vanguard" government to transition society from capitalism to communism. This is brought about by seizing the means of production and all capital from the rich and putting all of this into the hands of the community, the workers. According to Marx, this will end economic classes forever.