Marx is considered, next to Engel, as the creator of scientific socialism (modern communism) and as one of the most influential thinkers of contemporary history. By 1847, Marx and Engel were asked to elaborate on the principles and roles to unify all those associations and integrate them in the Liege of Justus (later called the Communist Liege). The resulting program was to be known worldwide as the Communist Manifest, written by Marx based on the work prepared by Engel, and it represented the first systematization of the modern socialist doctrine. This is how the history of society consists of the history of struggles and revolts, exploiters and the exploited, that is, the clash between the governing social classes and oppressed section of society. Marx concludes in the Manifest that the capitalist class will be overthrown and suppressed by a worldwide revolution, which will culminate in the establishment of a society without classes.