On this week’s Labor Heritage Power Hour: Poet Martín Espada joins Susan Eisenberg to read from Jailbreak of Sparrows—poems of work, class, and immigrant labor, including “Look at This” and “The Snake.” Then we mark the IWW’s Little Red Songbook anniversary with four classics: “Hold the Fort,” “The Internationale,” “Dump the Bosses Off Your Back,” and “Winnsboro Cotton Mill Blues.”