The Unbound Book Festival is coming up on Saturday, and KBIA has been talking to some of this year's authors in a series we're calling "Unbound Authors."Kim Kelly is probably best known for her labor column for Teen Vogue. Her new book, “The Untold History of American Labor: Fight Like Hell,” explores the stories of underrepresented and forgotten leaders in the labor movement. She spoke with KBIA's Lauren Hines.