William M. Tweed, often known as "Boss Tweed," was a prominent American politician in the 19th century. He was the leader of the Tammany Hall political machine in New York City, where he played a significant role in local politics during the 1860s and early 1870s. Tweed was known for his influence and power, as well as his ability to control city politics through patronage and corruption. Tweed's reign came to an end when he was exposed for his involvement in widespread corruption and embezzlement of public funds. His actions led to his arrest in 1871, and he was eventually convicted of fraud and conspiracy. Tweed's legacy serves as a cautionary tale about the dangers of political corruption and the importance of accountability in government.