Karl Marx developed Marxism, which interprets political practices and believes capitalism will be replaced by socialism and eventually communism. According to Marxism, society is divided into two classes: the proletariat, who must sell their labor to live, and the bourgeoisie, who own capital and the means of production. Marxism views the mass media as controlled by the ruling bourgeoisie class, who use it to publicize their worldviews and deny alternative ideas.