OP from Library of Congress.

The New York shirtwaist strike of 1909, also known as the Uprising of the 20,000, was a labour strike primarily involving Jewish women working in New York shirtwaist factories. It was the largest strike by female American workers up to that date. Led by Clara Lemlich and the International Ladies' Garment Workers' Union, and supported by the National Women's Trade Union League of America (NWTUL), the strike began in November 1909.

In February 1910, the NWTUL settled with the factory owners, gaining improved wages, working conditions, and hours. The end of the strike was followed only a year later by the Triangle Shirtwaist Factory fire, which exposed the plight of immigrant women working in dangerous and difficult conditions.

From Library of Congress.