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Formation of the Committee of Seventy

Name: Formation of the Committee of Seventy
Start: 1871-09-04
Location: Cooper Union

When: September 4, 1871
Where: Cooper Union
Part of: New York Committee of Seventy formed against Tammany Hall

Prominent New York reformers appointed a committee to examine the misdeeds of the Tweed ring, challenging Tammany Hall's control.

At a mass meeting at Cooper Union on September 4, 1871, a committee of seventy prominent New York reformers was appointed to examine the misdeeds of the Tweed ring. This action marked the beginning of organized opposition to Tammany Hall's political machine, aiming to reform local politics and combat corruption.

Sources

Tammany Hall Wikipedia, revision of 2026-09-28

Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.