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'''William Marcy Tweed''' (or ''William Magear Tweed''; byname "Boss Tweed"; 1823-– 1878), was a [[New York City]] [[Democratic Party]] leader who turned [[Tammany Hall]] into one of the most corrupt political machines in United States history, as well as running a network of close city officials under the so-called Tweed Ring, which was responsible for extorting [[kickback]]s from contractors and others doing business with the city, manipulating the public vote in his favor, and plundering more than $100,000,000 from the treasury before he was driven from power and arrested.