Karl Heinrich Marx (5 May 1818 – 14 March 1883) was a German philosopher, economist, sociologist, historian, journalist, and revolutionary socialist. His ideas played a significant role in the development of social science and the socialist political movement. He published various books during his lifetime, with the most notable being The Communist Manifesto (1848) and Capital (1867–1894); some of his works were co-written with his friend, the fellow German revolutionary socialist Friedrich Engels.
Marx’s theories about society, economics and politics, which are collectively known as Marxism, hold that all societies progress through the dialectic of class struggle. He was heavily critical of capitalism, which he called the “dictatorship of the bourgeoisie”, believing it to be run by the wealthy middle and upper classes purely for their own benefit. He predicted that, like previous socioeconomic systems, it would inevitably produce internal tensions which would lead to its self-destruction and replacement by a new system, socialism. Under socialism, he argued that society would be governed by the working class in what he called the “dictatorship of the proletariat”, the “workers state” or “workers’ democracy”. He believed that socialism would, in its turn, eventually be replaced by a stateless, classless society called pure communism. Along with believing in the inevitability of socialism and communism, Marx actively fought for the former’s implementation, arguing that both social theorists and underprivileged people should carry out organised revolutionary action to topple capitalism and bring about socioeconomic change.