Answer:
Led by Alexander Hamilton, albeit secretly at first, the Federalists were the first political party of the United States. They supported the Constitution, and attempted to convince the States to ratify the document. Hamilton, along with John Jay and James Madison, anonymously published a series of essays known as the Federalist Papers under the pseudonym "Publius."
Both Hamilton and Madison argued that the Constitution didn't need a Bill of Rights, that it would create a "parchment barrier" that limited the rights of the people, as opposed to protecting them. However, they eventually made the concession and announced a willingness to take up the matter of the series of amendments which would become the Bill of Rights. Without this compromise, the Constitution may never have been ratified by the States.
Surprisingly enough, it was Federalist James Madison who eventually presented the Bill of Rights to Congress despite his former stance on the issue.
