The Service Employees International Union (SEIU) is a labor union in the United States that represents workers in various sectors, including healthcare, public services, and property services. Founded in 1921, SEIU advocates for better wages, benefits, and working conditions for its members, who include nurses, janitors, and home care workers. SEIU is known for its strong emphasis on social justice and community organizing. The union engages in political activism to influence policies that affect workers' rights and public services. With millions of members, SEIU plays a significant role in the labor movement and strives to improve the lives of working people across the country.