Service Employees International Union (SEIU) is a labor union representing about 2.2 million workers in over 100 occupations in the United States, Canada, and Puerto Rico[2]. SEIU is focused on uniting workers in three sectors: health care (over half of the union's members work in the health care field), including hospital, home care and nursing home workers, public services (local and state government employees), and property services (including janitors, security officers and food service workers).