What weapon put Boss Tweed in jail?

Boss Tweed was not put in jail for a specific weapon. He was convicted of fraud and embezzlement related to his corrupt activities as the head of Tammany Hall, a powerful political machine in New York City.

The evidence against him included detailed drawings of the city's courthouse, which was being built with public funds but was vastly overpriced due to Tweed's schemes. These drawings, known as the "Tweed Ring", were crucial in his conviction.

While Tweed was known for his influence and power, it was ultimately his corrupt financial practices that led to his downfall.