Article III, Section 2, Clause 1:
The Judicial Power shall extend to all Cases, in Law and Equity, arising under this Constitution, the Laws of the United States, and Treaties made, or which shall be made, under their Authority;—to all Cases affecting Ambassadors, other public Ministers and Consuls;—to all Cases of admiralty and maritime Jurisdiction; to Controversies to which the United States shall be a Party;—to Controversies between two or more States; between a State and Citizens of another State; between Citizens of different States,—between Citizens of the same State claiming Lands under Grants of different States, and between a State, or the Citizens thereof, and foreign States, Citizens or Subjects.
The multiplication of government corporations during periods of war and depression has provided one motivation for limiting the doctrine of sovereign immunity. In Keifer & Keifer v. RFC, 1 the Court held that the government does not become a conduit of its immunity in suits against its agents or instrumentalities merely because they do its work. Nor does the creation of a government corporation confer upon it legal immunity. Whether Congress endows a public corporation with governmental immunity in a specific instance is a matter of ascertaining the congressional will. Moreover, it has been held that waivers of governmental immunity in the case of federal instrumentalities and corporations should be construed liberally. 2 On the other hand, Indian nations are exempt from suit without further congressional authorization; it is as though their former immunity as sovereigns passed to the United States for their benefit, as did their tribal properties. 3