Karl Heinrich Marx (5 May 1818 – 14 March 1883) was a German philosopher, political economist, historian, political theorist, sociologist, communist, and revolutionary, whose ideas are credited as the foundation of modern communism. Marx summarized his approach in the first line of chapter one of The Communist Manifesto, published in 1848: "The history of all hitherto existing society is the history of class struggles."
Marx argued that capitalism, like previous socioeconomic systems, would inevitably produce internal tensions which would lead to its destruction. Just as capitalism replaced feudalism, he believed socialism would, in its turn, replace capitalism, and lead to a stateless, classless society called pure communism. He argued that capitalism will end through the organized actions of an international working class.
While Marx remained a relatively obscure figure in his own lifetime, his ideas and the ideology of Marxism began to exert a major influence on workers' movements shortly after his death. This influence gained added impetus with the victory of the Bolsheviks in the Russian October Revolution in 1917, and few parts of the world remained significantly untouched by Marxian ideas in the course of the twentieth century. Marx is typically cited, with Émile Durkheim and Max Weber, as one of the three principal architects of modern social science.