From a historical perspective, the concept of revolution has two facets as G. A. Nasser observes in the above quotation. First, there is a revolution, which, out of sheer necessity for political freedom, sets out to get rid of imposed power upon the inhabitants. This imposed power can take a form of one person, as was the case with the Russian Revolution and the Zanzibar Revolution, to overthrow the Czarist' and the Sultan regimes, respectively. It can also take a* form of alien rule, without the due consent of the governed, as was the case with overthrow of the imperial power here in Africa and elsewhere. Second, a revolution can also be social in content, aiming at changing the social, political, economical" and cultural structures, so as to facilitate progress and harmony in a given society.