What position of power did William Marcy tweed hold?

William Marcy Tweed, commonly known as "Boss Tweed," held significant power as the leader of Tammany Hall, the Democratic Party political machine in New York City during the mid-19th century. He served as the head of the New York City Board of Supervisors and was also a member of the New York State Senate. His influence allowed him to control city politics and finances, leading to extensive corruption and embezzlement schemes. Tweed's reign ultimately ended with his arrest and conviction for fraud and corruption.