Final answer:
Labor unions have been the only significant institutions representing the rights of working people throughout history.
Step-by-step explanation:
Labor unions have been the only significant institutions representing the rights of working people throughout history to this day. Labor unions are organizations of workers that advocate for better conditions, protect their rights, and further their interests. These unions have played a crucial role in fighting for better wages, safer work environments, an end to child labor, healthcare benefits, and support programs for workers.