Labor Day has a deeper meaning. In 1894, the first Monday in September became a federal holiday to acknowledge the long and difficult struggle workers endured for fairness and recognition in the workplace. And it's these principles that fuel unions to fight for fair pay, pensions, health care, workplace safety, weekends off and an eight-hour day. This struggle - led by unions - made it possible for a strong middle class to thrive and created the greatest workforce in the world.