Karl Marx was a Prussian-German philosopher and revolutionary socialist. His ideas played a significant role in the establishment of the social sciences and the development of the socialist movement. Marx’s work in economics laid the basis for our understanding of labor and its relation to capital, and has influenced much of subsequent economic thought. He published numerous books during his lifetime, the most notable being The Communist Manifesto (1848) and Capital (1867). Marx called capitalism the “dictatorship of the bourgeoisie,” believing it to be run by the wealthy classes for their own benefit, and advocated for socialism, which would inevitably lead to a stateless, classless society called communism. Theoretical variants of Marxism include Leninism, Stalinism, Trotskyism and Maoism. Marx was born on May 5, 1818.
P.S. Karl was not one of the Marx Brothers.