Which Founding Father, originally an opponent of the Bill of Rights, is said to have 'hounded his colleagues relentlessly' to secure Congress's passage of the Bill of Rights (which were then sent to the states for ratification)?

The Bill of Rights is the first 10 Amendments to the Constitution. It spells out Americans' rights in relation to their government. It guarantees civil rights and liberties to the individual—like freedom of speech, press, and religion.