Federalist 51

In a representative democracy it is not only important to guard against the oppression of rulers, it is equally important to guard against the injustice which may be inflicted by certain citizens or groups. Majorities often threaten the rights of minorities. There are only two methods of avoiding evil. The first is to construct a powerful government, a "community will." Such a "will' is larger than, and independent of, the simple majority. This "solution" is dangerous because such a government might throw its power behind a group in society working against the public good. In our country, the authority to govern comes from the entire society. In addition, under the Constitution society is divided into many groups of people who hold different views and have different interests. This makes it very difficult for one group to dominate or threaten the minority groups.