Le document fondateur du mouvement ouvrier moderne, publie en 1848. Il explique pourquoi le communisme ne decoule pas de principes preconcus, mais de faits et de mouvements proletariens issus de la lutte de classe concrete. Founding document of the modern working-class movement, published in 1848. Explains why communism is derived not from preconceived principles but from facts and from proletarian movements springing from the actual class struggle. Founding document of the modern working-class movement, published in 1848. Explains why communism is not a set of preconceived principles but the line of march of the working class toward power, ?springing from an existing class struggle, a historical movement going on under our very eyes.?