The slavery is illegitimate because not if of the one of natural form, of free spontaneous will and yes for obligation and imposition, not for having. Nobody if of gratuitously being explored, that is madness and madness do not create right. Thus, whichever the way to face the things, null is the right of slavery not only for being illegitimate, but for being nonsense and nothing to mean. The words slavery and right are contradictory, are abstained mutually. It wants of a man to another one, it wants of a man a people, will be always equally insensato this speech: ' ' I establish with you a convention being everything your position and everything in my advantage, convention this the one that I will obey to aprouver while me and that you will observe while will be of mine agrado' '. (ROUSSEAU, 1996, p.29-30) 2,1 the People and the Common good the people need to be conscientious and to give account that before choosing its representatives they need to possess the convention of that they are people, therefore the previous convention is determinative point for the life of the same ones. The individuals must conserve and enter in concert (agreement or harmony), using of the force and the freedom as primordial elements of its conservation, is, therefore, there where is the problem, that is, if I need to survive, I I need to help the people, I am there with the people (Social Contract) and where I am my freedom? Therefore, he is interesting to perceive since the bedding of the Social contract it is the survival. Rousseau launched bases of communism (common agreement), because it said that the Social Contract if only carries through from the total alienation, that is, when violating the pact social each one return its first rights and retakes its freedom natural, losing the conventional freedom for which to resign to that one.