Final answer:
Karl Marx and Friedrich Engels were two leading critics of the capitalist system. They co-authored The Communist Manifesto and critiqued capitalism while proposing a vision of a true communist society.
Step-by-step explanation:
Two leading critics of the capitalist system were Karl Marx and Friedrich Engels. Marx co-authored The Communist Manifesto in 1848, which critiqued capitalism and proposed a vision of a true communist society. He saw industrialization as the final struggle between the workers (proletariat) and the capitalists (bourgeoisie), eventually leading to the proletariat's victory and the creation of a socialist utopia.