The monopoly of capital becomes a fetter upon the mode of production, which has sprung up and flourished along with, and under it. Centralisation of the means of production and socialisation of labour at last reach a point where they become incompatible with there capitalist integument. This integument is burst asunder. The knell of capitalist private property sounds. The expropriators are expropriated.

Vol. I, Ch. 32, p. 837. - Das Kapital (Buch I) (1867)