A line of cleavage thus presents itself between those, on the one hand, who would continue the old methods of economic warfare, together with the advocates of physical force, and, on the other hand, the advocates of united political action by the working class, consciously directed toward the socialization of industry and its products. The measure of the crystallization of this latter force is represented by the strength of the political Socialist movement. Whoever has studied the labor movement during the past few years must have realized that there is a tremendous drift of sentiment in favor of that policy in the labor unions of the country. The clamor for political action in the labor unions presages an enormous advance of the political Socialist movement during the next few years. The struggle between the capitalist and working classes must become a political issue, the supreme political issue. This must result, not only because the collective ownership of property can best be brought about by political methods, but also because the capitalists themselves have taken the industrial struggle into the political arena to suit themselves; and when the workers realize the issue and accept it, the capitalists will not be able to resist them. One is reminded of the saying of Marx that capitalism produces its own gravediggers. In taking the industrial issue into the political sphere, to suit their own immediate advantages, the capitalists were destined to reveal to the workers, sooner or later, their power and opportunity.