Nast's drawings were instrumental in the downfall of Boss Tweed, the powerful Tammany Hall leader.
As commissioner of public works for New York City, Tweed led a ring that by 1870 had gained total control of the city's government, and controlled "a working majority in the State Legislature".
Tweed and his associates—Peter Barr Sweeny (park commissioner), Richard B. Connolly (controller of public expenditures), and Mayor A. Oakey Hall—defrauded the city of many millions of dollars by grossly inflating expenses paid to contractors connected to the Ring.
Nast, whose cartoons attacking Tammany corruption had appeared occasionally since 1867, intensified his focus on the four principal players in 1870 and especially in 1871.

Tweed so feared Nast's campaign that he sent an emissary to offer the artist a bribe of $100,000, which was represented as a gift from a group of wealthy benefactors to enable Nast to study art in Europe.
Feigning interest, Nast negotiated for more before finally refusing an offer of $500,000 with the words, "Well, I don't think I'll do it.
I made up my mind not long ago to put some of those fellows behind the bars".
Nast pressed his attack in the pages of Harper's, and the Ring was removed from power in the election of November 7, 1871.
Tweed was arrested in 1873 and convicted of fraud.
When Tweed attempted to escape justice in December 1875 by fleeing to Cuba and from there to Spain, officials in Vigo were able to identify the fugitive by using one of Nast's cartoons.
Nast's drawings were instrumental in the downfall of Boss Tweed, the powerful Tammany Hall leader. As commissioner of public works for New York City, Tweed led a ring that by 1870 had gained total control of the city's government, and controlled "a working majority in the State Legislature". Tweed and his associates—Peter Barr Sweeny (park commissioner), Richard B. Connolly (controller of public expenditures), and Mayor A. Oakey Hall—defrauded the city of many millions of dollars by grossly inflating expenses paid to contractors connected to the Ring. Nast, whose cartoons attacking Tammany corruption had appeared occasionally since 1867, intensified his focus on the four principal players in 1870 and especially in 1871.
Tweed so feared Nast's campaign that he sent an emissary to offer the artist a bribe of $100,000, which was represented as a gift from a group of wealthy benefactors to enable Nast to study art in Europe. Feigning interest, Nast negotiated for more before finally refusing an offer of $500,000 with the words, "Well, I don't think I'll do it. I made up my mind not long ago to put some of those fellows behind the bars". Nast pressed his attack in the pages of Harper's, and the Ring was removed from power in the election of November 7, 1871. Tweed was arrested in 1873 and convicted of fraud. When Tweed attempted to escape justice in December 1875 by fleeing to Cuba and from there to Spain, officials in Vigo were able to identify the fugitive by using one of Nast's cartoons.
Thomas Nast