Who believed the Bill of Rights was needed?

Answer 1

The people in the States. The Constitution went from State to State for ratification. During this ratification process the people in the meeting's expressed the need to further detail these elements which in finality became the first 10 Amendments to the Constitution which are known as the Bill of Rights and are unable to be restricted or removed by another amendment.

Those representing the state of Virginia were among the most vocal in insisting that a Bill of Rights segment be added to the Constitution.

Answer 2

The Feds and Anti-feds did not debate over a bill of rights, they debated over having a federal government or independent state governments. This was before the signing of the constitution in 1787. An example of these different points of views is the fact that Alexander Hamilton wrote the Federalist Papers, a series of essays supporting a federal-state government structure.