the executive committee of the Democratic Party in New York City historically exercising political (political machine) control through the typical boss-ist blend of charity and patronage. The name was derived from a pre-Revolutionary association named after Tammanend, a wise and benevolent Delaware Indian chief. When Tammany was organized in New York in 1789, it represented middle-class opposition to the power of the “aristocratic” Federalist Party. Incorporated in 1805 as a benevolent body, the Society of Tammany became identified with the Democratic Party by means of identical leadership within both organizations.

The makeup of the society was substantially altered in 1817 when Irish immigrants, protesting Tammany bigotry, forced their right to membership and benefits. Later Tammany championed the spread of the franchise to white propertyless males. Nevertheless, the society's appeal to particular ethnic and religious minorities, the doling out of gifts to the poor, and the bribing of rival political faction leaders, among them the notorious “Boss” William M. Tweed, made the name Tammany Hall synonymous with urban political corruption.

Tammany's power was formidable in the 19th and early 20th centuries, but its control over New York politics was diminished when Pres. Franklin D. Roosevelt (Roosevelt, Franklin D.) reduced its status to a county organization after it failed to support him in 1932. It further declined in power during the reform administrations of mayors Fiorello H. La Guardia (1933–45) and John V. Lindsay (1966–73).