Friedrich Engels was a philosopher, sociologist, journalist, revolutionary and German socialist theoretician. Engels was the son of the owner of a major textile factory in Manchester, England. Friend and collaborator of Karl Marx, was coauthor with this works like The situation of the working class in England (1845) and the Manifesto of the Communist Party (1848), fundamental for the birth of Marxism and the socialist, communist and union. He was political leader of the First International (1864) and the Second International (1889). He also helped Marx financially to publish Capital in 1867, and after his death, he edited the second and third volumes. In addition, Engels organized the notes of Marx to compose Theories on surplus value, which he later published as "fourth volume" of Capital.
