The 19th-century leader of New York City's Tammany Hall who went to prison after conviction on charges involving massive fraud was:.

William Magear Tweed

Explanation:

William Tweed was a leader Tammany Hall, New York City. Tweed elected to the House of Representatives in the United States in 1852. He involved in massive fraud stealing millions of money from New York City taxpayers. Tammany Hall was a political machine which was consist of dishonest politicians who played a role in controlling New York City and its politics. They also helped immigrants and benefited through getting a rise in politics from the 1790s.

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answer; positive reinforcement;