The primary source of the social and economic doctrine of communism. It was written as Das Manifest der Kommunistischen Partei in 1848 by Karl Marx and Friedrich Engels to provide a political programme that would establish a common tactic for the working-class movement. The manuscript was adopted by the German Socialist League of the Just as its manifesto. It proposed that all history had hitherto been a development of class struggles, and asserted that the industrialized proletariat would eventually establish a classless society safeguarded by social ownership. It linked socialism directly with communism and set out measures by which the latter could be achieved. It had no immediate impact and Marx suggested it should be shelved when the Revolutions of 1848 failed. Nevertheless, it continued to influence world-wide communist movements throughout the 20th century.