Utility Workers Union of America
AFL - CIO Local 127

Your union contract will not cover everyone in your workplace. Probably on the first page or so, you’ll find the definition of the bargaining unit and jurisdiction covered. Whether the boundaries of contract coverage are based on type of work performed, location, or other factors, the agreement itself will set forth who’s covered and who’s not. And with technology and other factors transforming American workplaces at a rapid pace, your contract may even specify how it is to be determined whether new types of work that come into existence will or won’t be covered by the terms of the contract.
—Adapted from The Union Member's Complete Guide, by Michael Mauer