Which group opposed the bill of rights because it was believed the constitution adequately protected basic rights?

The Federalists, primarily led by Alexander Hamilton, James Madison, and John Jay, believed that establishing a large national government was not only possible, but necessary to “create a more perfect union” by improving the relationship among the states. Until this point, the common belief was that a republic could only function efficiently it was small and localized. The Federalists challenged this belief and claimed that a strong national republic would better preserve the individual liberties of the people. By extending the sphere of the republic, individual and minority rights would be better protected from infringement by a majority. The federalists also wanted to preserve the sovereignty and structure of the states. 

February 1848 is when it was added. if that's what you were asking