Karl Marx

Karl Heinrich Marx 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. This would emerge after a transitional period called the "dictatorship of the proletariat": a period sometimes referred to as the "workers state" or "workers' democracy".

Marx argued that socio-economic change occurred through organized revolutionary action. He argued that capitalism will end through the organized actions of an international working class: "Communism is for us not a state of affairs which is to be established, an ideal to which reality will have to adjust itself. We call communism the real movement which abolishes the present state of things. The conditions of this movement result from the premises now in existence."

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 as one of the principal architects of modern social science.