The Anti-Federalists, who were a political coalition that opposed the establishment of a strong central government, pushed for the addition of a Bill of Rights to the United States Constitution because they wanted to establish limitations on governmental power and protect basic liberties of people such as the freedom of religion, and of press, right to enjoy a speedy and public trial by an impartial jury in criminal prosecutions, right to be free from unreasonable government intrusion in one's homes and right to have reserved powers.
