Karl Marx and Friedrich Engels wrote their Manifesto in December 1847, as a guide to the fundamental principles and practices of Communists. The Manifesto also predicted the ultimate downfall of the capitalist system.
(Summary written by Gesine)
A recording in the original German language is available here [http://librivox.org/manifest-der-kommunistischen-partei-von-karl-marx-und-friedrich-engels/]