Elizabeth Gurley Flynn described herself as a “mortal enemy of capitalism.” This lecture explains how Flynn became a socialist and traces the arc of her career as an activist. She began as a teen-aged soapbox speaker on the streets of New York City. She became an organizer for the Industrial Workers of the World, where she helped lead landmark strikes in Lawrence, Mass. (1912) and Paterson, N.J. (1913). She joined the Communist Party in the 1930s, becoming a key leader, and serving time in prison during the McCarthy era. Her biography illuminates the history of the radical labor movement in the United States.