Out of the given options, Thomas Nast is the cartoonist who dared to expose the government corruption in NYC.
German-born American cartoonist, Thomas Nast was also called the Father of the American Cartoon.
He used his cartoons column in the paper to attack the government machine at the time in New York.
He would portray then NYC political government leader "Boss" Tweed as a fat money minter. This brought his case to people's highlight and his eventual downfall in the 1870s.
Later it was found after his cartoons were published that Tweed had been swindling a ton of money from the government. Thus exposing the scam as it was then eventually covered by the papers.
Nast was very vocal about his support for the abolition of slavery through his cartoons in the 1860s.
He continued to be published in Harper's Weekly till the late 1880s.
After losing his savings, and becoming destitute in 1884, however, he continued his illustrations and was appointed consul general in Ecuador in 1902.
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