Such Classes of Subjects as are implicitly excepted in the Enumeration of the Classes of Subjects by this Act assigned exclusively to the Legislatures of the Provinces.The Judicial Committee of the Privy Council held that: A transportation or communication work or undertaking will be under government control under section 92(10) where it is extending outside of the province.
Television programming has been held to be part of that jurisdiction but it is unclear whether it is so only because it is ancillary to the regulation of communications undertaking.
Whenever parliament invokes the power, it gains not only jurisdiction over the work but also any necessarily incidental operations.
The Supreme Court held that that declaration gave Parliament the authority to regulate the work "as a going concern" which included jurisdiction over workers at the plant and their labour unions.
The declaration must be made by the passing of legislation, but in addition to declaring specific works, whole classes of work can be defined as being "for the general advantage of Canada" by default; the Atomic Energy Control Act, for example, deemed all nuclear power plants to fall into this category.