What did Clara Lemlich accomplish in 1909

Clara Lemlich Shavelson (March 28, 1886 - July 12, 1982) was a leader of the Uprising of 20,000, the massive strike of shirtwaist workers in New York's garment industry in 1909. Later blacklisted from the industry for her labor union work, she became a member of the Communist Party USA and a consumer activist.