marxists.org/archive/marx/works/1847/11/prin-com.htm
The proletariat is that class in society which lives entirely from the sale of its labor and does not draw profit from any kind of capital; whose weal and woe, whose life and death, whose sole existence depends on the demand for labor – hence, on the changing state of business, on the vagaries of unbridled competition. The proletariat, or the class of proletarians, is, in a word, the working class of the 19th century.
This industrial revolution was precipitated by the discovery of the steam engine, various spinning machines, the mechanical loom, and a whole series of other mechanical devices. These machines, which were very expensive and hence could be bought only by big capitalists, altered the whole mode of production and displaced the former workers, because the machines turned out cheaper and better commodities than the workers could produce with their inefficient spinning wheels and handlooms. The machines delivered industry wholly into the hands of the big capitalists and rendered entirely worthless the meagre property of the workers (tools, looms, etc.). The result was that the capitalists soon had everything in their hands and nothing remained to the workers. This marked the introduction of the factory system into the textile industry.
Once the impulse to the introduction of machinery and the factory system had been given, this system spread quickly to all other branches of industry, especially cloth- and book-printing, pottery, and the metal industries.
Labor was more and more divided among the individual workers so that the worker who previously had done a complete piece of work now did only a part of that piece. This division of labor made it possible to produce things faster and cheaper. It reduced the activity of the individual worker to simple, endlessly repeated mechanical motions which could be performed not only as well but much better by a machine. In this way, all these industries fell, one after another, under the dominance of steam, machinery, and the factory system, just as spinning and weaving had already done.
But at the same time, they also fell into the hands of big capitalists, and their workers were deprived of whatever independence remained to them. Gradually, not only genuine manufacture but also handicrafts came within the province of the factory system as big capitalists increasingly displaced the small master craftsmen by setting up huge workshops, which saved many expenses and permitted an elaborate division of labor.
This is how it has come about that in civilized countries at the present time nearly all kinds of labor are performed in factories – and, in nearly all branches of work, handicrafts and manufacture have been superseded. This process has, to an ever greater degree, ruined the old middle class, especially the small handicraftsmen; it has entirely transformed the condition of the workers; and two new classes have been created which are gradually swallowing up all the others. These are:
(i) The class of big capitalists, who, in all civilized countries, are already in almost exclusive possession of all the means of subsistance and of the instruments (machines, factories) and materials necessary for the production of the means of subsistence. This is the bourgeois class, or the bourgeoisie.
(ii) The class of the wholly propertyless, who are obliged to sell their labor to the bourgeoisie in order to get, in exchange, the means of subsistence for their support. This is called the class of proletarians, or the proletariat.
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