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William Magear Tweed (April 3, 1823 – April 12, 1878), often erroneously referred to as "William Marcy Tweed" (see below),[1] and widely known as "Boss" Tweed, was an American politician most notable for being the "boss" of Tammany Hall, the Democratic Party political machine that played a major role in the politics of 19th-century New York City and State
