The Communit Manifesto was written by Karl Marx with some help by Freidrich Engles. REAL Marxism IS Communism, where the proleteriat takes over govement and rids society of classes.
Unfortunately, as always, oligarchs took the reigns of governing, and workers became little more than mere serfs in a corrupt State controlled monopoly with no flexibilty, competition, nor incentive for worker productivity, and stagnation and a shrinking economy sank in. Basically the direction we are going through today (albeit in reverse), and accelerated by the current adminstration.