Robert Yates was an influential American politician and a key figure during the Constitutional Convention of 1787, known for his opposition to the federal Constitution. He was a staunch Anti-Federalist who believed that the proposed Constitution would create a powerful central government at the expense of state sovereignty and individual liberties. Yates's ideas were prominently expressed in his writing of 'Brutus 1,' where he articulated concerns about factions, representation, and the potential for tyranny within a large republic.