In contrasting the temperaments, the points of view, the philosophy, and the methods of these two antagonistic minds, I have been forced to take two extremes, the Bakouninist anarchist and the Marxian socialist. In the case of the former, it has been necessary to present the views of a particular school of anarchism, more or less regardless of certain other schools. Proudhon, Stirner, Warren, and Tucker do not advocate violent measures, and Tolstoi, Ibsen, Spencer, Thoreau, and Emerson—although having the anarchist point of view—can hardly be conceived of as advocating violent measures.... I have not dealt with the philosophical anarchism, or whatever one may call it, of these last.

p.xii-xiii - Violence and the Labor Movement (1914)