'The Communist Manifesto', written by Karl Marx and Friedrich Engels in 1848, is a political pamphlet that outlines the theory of class struggle and the need for a proletarian revolution to overthrow capitalist societies. The document serves as a rallying cry for the working class, emphasizing the idea that history is shaped by the conflict between oppressors and the oppressed. It played a crucial role in the revolutionary movements of the 19th and early 20th centuries, influencing labor movements and socialist ideologies across Europe.