| International Association of Machinists and Aerospace Workers - IAM |
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| International Brotherhood of Boilermakers, Iron Shipbuilders, Blacksmiths, Forgers and Helpers |
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| Sheet Metal Workers' International Association
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| United Steelworkers - USW |
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| International Union, United Automobile, Aerospace & Agricultural Implement Workers of America - UAW |
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| International Union of Electronic, Electrical, Salaried, MAchine and Furniture Workers - Communications Workers of America - IUE-CWA |
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| International Union of Elevator Constructors - IUEC |
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| International Federation of Professional & Technical Engineers - IFPTE |
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