Mary Harris "Mother" Jones (1837 - November 30, 1930) was an Irish schoolteacher and dressmaker who became a prominent labor and community organizer, who helped coordinate major strikes and co-founded the Industrial Workers of the World. Jones worked as a teacher and dressmaker but after her husband and four children all died of yellow fever and her workshop was destroyed in a fire in 1871 she began working as an organizer for the Knights of Labor and the United Mine Workers union. She was a very effective speaker, punctuating her speeches with stories, audience participation, humor and dramatic stunts. From 1897 (when she was 60) she was known as Mother Jones and in 1902 she was called "the most dangerous woman in America" for her success in organizing mine workers and their families against the mine owners. In 1903, upset about the lax enforcement of the child labor laws in the Pennsylvania mines and silk mills, she organized a Children's March from Philadelphia to the home of then president Theodore Roosevelt in New York. She died in 1930 at the age of 93.