Final answer:
Marx discusses the bourgeoisie and proletariat, who have opposing interests.
Step-by-step explanation:
Karl Marx discusses two primary classes: the bourgeoisie and the proletariat. The bourgeoisie are the owners of the means of production, such as factories and mines, while the proletariat are the workers who labor for the bourgeoisie. These two classes have opposing interests because the bourgeoisie seek to maximize their profits and maintain their power, while the proletariat seek to improve working conditions and increase their wages.