SEIU Local 509 represents over 11,000 Human Service workers throughout Massachusetts. Several thousand SEIU 509
members work as professional, direct care, and support staff at private
agencies that receive public funding to provide a variety of social
services to elders, at-risk children, and people with mental illness and developmental disabilities.
SEIU Local 509 is part of the Service Employees International Union, the largest and fastest-growing labor union in the United States, with 2 million members. Focused on uniting workers in four sectors–-public services, long term care, property services, and hospital systems–-SEIU is the largest health care union, the largest property services union, and the second-largest public employees union.
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