Columbia subject headings:
Labor movement--Pennsylvania--Pittsburgh.
Service Employees International Union.
Service industries workers--Labor unions--Pennsylvania--Pittsburgh--Case studies.
Harvard subject headings:
Labor movement--Pennsylvania--Pittsburgh.
Service Employees International Union.
Service industries workers--Labor unions--Pennsylvania--Pittsburgh--Case studies.
Princeton subject headings:
Labor movement--Pennsylvania--Pittsburg.
Service Employees International Union.
Service industries workers--Labor unions--Pennsylvania--Pittsburgh.