An essential piece of Disney history has been largely unreported for eighty years. Soon after the birth of Mickey Mouse, one animator raised the Disney Studio far beyond Walt’s expectations. That animator also led a union war that almost destroyed it. Art Babbitt animated for the Disney studio throughout the 1930s and through 1941, years in which he and Walt were jointly driven to elevate animation as an art form, up through Snow White, Pinocchio, and Fantasia. But as America prepared for World War II, labor unions spread across Hollywood. Disney fought the unions while Babbitt embraced...