North American Industry Classification System (NAICS) 1997

• 81 - Other Services (except Public Administration)
• 813 - Religious, Grant-Making, Civic, and Professional and Similar Organizations
• 8139 - Business, Professional, Labour and Other Membership Organizations

81393 - Labour Organizations

This industry comprises establishments primarily engaged in the regulation of relations between employers and employees. These establishments negotiate with employers to improve the income and working conditions of their members.