Franz Oppenheimer, The State: Its History and Development viewed Sociologically, authorized translation by John M. Gitterman (New York: B.W. Huebsch, 1922). 
There are two fundamentally opposed means whereby man, requiring sustenance, is impelled to obtain the necessary means for satisfying his desires. These are work and robbery, one’s own labor and the forcible appropriation of the labor of others. Robbery! Forcible appropriation! These words convey to us ideas of crime and the penitentiary, since we are the contemporaries of a developed civilization, specifically based on the inviolability of property. And this tang is not lost when we are convinced that land and sea robbery is the primitive relation of life, just as the warriors’ trade—which also for a long time is only organized mass robbery—constitutes the most respected of occupations. Both because of this, and also on account of the need of having, in the further development of this study, terse, clear, sharply opposing terms for these very important contrasts, I propose in the following discussion to call one’s own labor and the equivalent exchange of one’s own labor for the labor of others, the “economic means” for the satisfaction of needs, while the unrequited appropriation of the labor of others will be called the “political means.”
The idea is not altogether new; philosophers of history have at all times found this contradiction and have tried to formulate it. But no one of these formulæ has carried the premise to its complete logical end. At no place is it clearly shown that the contradiction consists only in the means by which the identical purpose, the acquisition of economic objects of consumption, is to be obtained. Yet this is the critical point of the reasoning. In the case of a thinker of the rank of Karl Marx, one may observe what confusion is brought about when economic purpose and economic means are not strictly differentiated. All those errors, which in the end led Marx’s splendid theory so far away from truth, were grounded in the lack of clear differentiation between the means of economic satisfaction of needs and its end. This led him to designate slavery as an “economic category,” and force as an “economic force”—half truths which are far more dangerous than total untruths, since their discovery is more difficult, and false conclusions from them are inevitable.
On the other hand, our own sharp differentiation between the two means toward the same end, will help us to avoid any such confusion. This will be our key to an understanding of the development, the essence, and the purpose of the State; and since all universal history heretofore has been only the history of states, to an understanding of universal history as well. All world history, from primitive times up to our own civilization, presents a single phase, a contest namely between the economic and the political means; and it can present only this phase until we have achieved free citizenship.