in 1905. Elected secretary of her local and a delegate to the New York City Central Labor Union, she came into contact with the New York Women's Trade Union League (WTUL), an organization that lent moral and financial support to the organizing efforts of women workers. She quickly became one of the most prominent members and was elected the New York branch's vice president in 1908. She left the factory to work for the league, attending school with a stipend provided by one of the League's wealthy supporters. She was an active participant in the Uprising of the 20,000, the massive strike of shirtwaist workers in New York City led by the International Ladies' Garment Workers' Union in 1909. She also was a key member of the first International Congress of Working Women of 1919, which aimed to address women's working conditions at the first annual International Labour Organization Convention. Triangle Shirtwaist Factory fire The Triangle Shirtwaist Factory fire in 1911, in which 146 garment workers were burned alive or died jumping from the ninth floor of a factory building, dramatized the conditions that Schneiderman, the WTUL and the union movement were fighting. The WTUL had documented similar unsafe conditions – factories without fire escapes or that had locked the exit doors to keep workers from stealing materials – at dozens of sweatshops in New York City and surrounding communities; twenty-five workers had died in a similar sweatshop fire in Newark, New Jersey, shortly before the Triangle disaster. Schneiderman expressed her anger at the memorial meeting held in the Metropolitan Opera House on April 2, 1911, to an audience largely made up of the well-heeled members of the WTUL: Despite her harsh words, Schneiderman continued working in the WTUL as an organizer, returning to it after a frustrating year on the staff of the male-dominated ILGWU. She subsequently became president of its New York branch, then its national president for more than twenty years until it disbanded in 1950. In 1920, Schneiderman ran for the United States Senate as the candidate of the New York State Labor Party, receiving 15,086 votes and finishing behind the Prohibitionist Ella A. Boole (159,623 votes) and the Socialist Jacob Panken (151,246). Her platform had called for the construction of nonprofit housing for workers, improved neighborhood schools, publicly owned power utilities and staple food markets, and state-funded health and unemployment insurance for all Americans. Schneiderman