[(21)] Lombroso, op. cit., pp. 52-54.
[(22)] Marx and Engels, The Communist Manifesto, p. 29 (C. H. Kerr & Co., Chicago, 1906).
[(23)] Reprinted in Guesde's Quatre ans de lutte des classes, pp. 88-91 (G. Jacques et Cie., Paris, 1901).
[(24)] Idem, p. 92.
[(25)] Bebel, Attentate und Sozialdemokratie, pp. 12-14.
[(26)] Idem, p. 1.
[(27)] Goldman, Anarchism and Other Essays, pp. 92-93.
[(28)] Idem, pp. 85-86.
[(29)] This is a translation of an editorial that has appeared in various foreign newspapers and also, it is said, in the Illinois Staats-Zeitung; Cf. De Leon, Socialism versus Anarchism, p. 61 (New York Labor News Company, New York).