James Winthrop
Encyclopedia
James Winthrop wrote the Letters of Agrippa
Letters of Agrippa
The Letters of Agrippa were most likely written by James Winthrop. They were a part of the antifederalist movement in the United States....

 (November 1787-January 1788) http://www.constitution.org/afp/agrippa.htm which appeared in the Massachusetts Gazette. He was part of the anti-federalist movement
Anti-Federalism
Anti-Federalism refers to a movement that opposed the creation of a stronger U.S. federal government and which later opposed the ratification of the Constitution of 1787. The previous constitution, called the Articles of Confederation, gave state governments more authority...

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