(1880 – September 1, 1960) was an influential American folk singer and a union activist. Her full name was Mary Magdalene Garland Stewart Jackson Stamos. She was discovered in November 1931 by the Dreiser Committee, investigating mining conditions in Harlan County when she spoke and sang her song "Ragged, Hungry Blues" in front of the committee. In December 1931, Jackson traveled to New York City to support and raise money for striking Harlan coal miners against tobacco. She made her recording debut on December 10, 1931.