who owns the means of production under capitalism
Means of production Mode of production (German: Produktionsweise) means the dominant way in which production is organised in society. For instance, "capitalism" is the name for the capitalist mode of production in which the means of production are owned privately by a small class (the bourgeoisie) who profits off the labour of the working class (the proletariat). Communism is a mode of production in which the means of production are not owned by anyone, but shared in common, without class based exploitation.
The Communist Manifesto The first section of the Manifesto, "Bourgeois and Proletarians", elucidates the materialist conception of history, that "the history of all hitherto existing society is the history of class struggles". Societies have always taken the form of an oppressed majority living under the thumb of an oppressive minority. In capitalism, the industrial working class, or proletariat, engage in class struggle against the owners of the means of production, the bourgeoisie. As before, this struggle will end in a revolution that restructures society, or the "common ruin of the contending classes". The bourgeoisie, through the "constant revolutionising of production [and] uninterrupted disturbance of all social conditions" have emerged as the supreme class in society, displacing all the old powers of feudalism. The bourgeoisie constantly exploits the proletariat for its labour power, creating profit for themselves and accumulating capital. However, in doing so, the bourgeoisie serves as "its own grave-diggers"; the proletariat inevitably will become conscious of their own potential and rise to power through revolution, overthrowing the bourgeoisie.