Gotham on the Brink
Tammany Hall, also known as the Society of St. Tammany, the Sons of St. Tammany, or the Columbian Order, is a Gotham political organization founded in 1786. It is the Democratic Party political machine that played a major role in controlling Gotham and New York State politics.
It specializes in vote-buying and influence-peddling but has never been officially accused of any crime. It has been effective in limiting direct corruption in individuals. There are strong indications that it is getting tired of Mayor Walker.
The base of Tammany Hall’s power is its control over how the immigrant population votes. In return it promotes candidates who support Immigrant causes.