Definition of Tammany Hall noun from the Oxford Advanced Learner's Dictionary

 

Tammany Hall

 noun
noun
BrE BrE//ˌtæməni ˈhɔːl//
 
; NAmE NAmE//ˌtæməni ˈhɔːl//
 
 
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a dishonest political organization that had a lot of influence in New York City in the 19th and early 20th centuries (sometimes used to refer to any dishonest political organization) She turned the club’s financial committee into Tammany Hall. Culture Tammany Hall was the popular name for the Tammany Society, the Democratic Party organization that ruled New York City from the 1830s to the 1930s. They bought votes and made illegal agreements. The organization was named after the building in which they met.
See the Oxford Advanced American Dictionary entry: Tammany Hall