A State law requiring importers to take out a license to sell imported goods amounts to an indirect tax on imports and hence is unconstitutional.[1747] Likewise, a franchise tax upon foreign corporations engaged in importing nitrate and selling it in the original packages,[1748] a tax on sales by brokers[1749] and auctioneers[1750] of imported merchandise in original packages, and a tax on the sale of goods in foreign commerce consisting of an annual license fee plus a percentage of gross sales,[1751] have been held invalid. On the other hand, pilotage fees,[1752] a tax upon the gross sales of a purchaser from the importer,[1753] a license tax upon dealing in fish which, through processing, handling, and sale, have lost their distinctive character as imports,[1754] an annual license fee imposed on persons engaged in buying and selling foreign bills of exchange,[1755] and a tax upon the right of an alien to receive property as heir, legatee, or donee of a deceased person[1756] have been held not to be duties on imports or exports.
Property Taxes
Property brought into the United States from without is immune from ad valorem taxation so long as it retains its character as an import,[1757] but the proceeds of the sale of imports, whether in the form of money or notes, may be taxed by a State.[1758] A property tax levied on warehouse receipts for whiskey exported to Germany was held unconstitutional as a tax on exports.[1759]
Inspection Laws
Inspection laws "are confined to such particulars as, in the estimation of the legislature and according to the customs of trade, are deemed necessary to fit the inspected article for the market, by giving the purchaser public assurance that the article is in that condition, and of that quality, which makes it merchantable and fit for use or consumption."[1760] In Turner v. Maryland[1761] the Supreme Court listed as recognized elements of inspection laws, the "quality of the article, form, capacity, dimensions, and weight of package, mode of putting up, and marking and branding of various kinds, * * *" .[1762] It sustained as an inspection law a charge for storage and inspection imposed upon every hogshead of tobacco grown in the State and intended for export, which the law required to be brought to a State warehouse to be inspected and branded. The Court has cited this section as a recognition of a general right of the States to pass inspection laws, and to bring, within their reach articles of interstate, as well as of foreign, commerce.[1763] But on the ground that, "it has never been regarded as within the legitimate scope of inspection laws to forbid trade in respect to any known article of commerce, irrespective of its condition and quality, merely on account of its intrinsic nature and the injurious consequences of its use or abuse," it held that a State law forbidding the importation of intoxicating liquors into the State could not be sustained as an inspection law.[1764] Since the adoption of the Twenty-first Amendment, such State legislation is valid whether classified as an inspection law or not.
Clause 3. No State shall, without the Consent of Congress, lay any Duty of Tonnage, keep Troops, or Ships of War in time of Peace, enter into any Agreement or Compact with another State, or with a foreign Power, or engage in War, unless actually invaded, or in such imminent Danger as will not admit of delay.
TONNAGE DUTIES
The prohibition against tonnage duties embraces all taxes and duties, regardless of their name or form, whether measured by the tonnage of the vessel or not, which are in effect charges for the privilege of entering, trading in, or lying in a port.[1765] But it does not extend to charges made by State authority, even if graduated according to tonnage,[1766] for services rendered to the vessel, such as pilotage, towage, charges for loading and unloading cargoes, wharfage, or storage.[1767] For the purpose of determining wharfage charges, it is immaterial whether the wharf was built by the State, a municipal corporation or an individual; where the wharf is owned by a city, the fact that the city realized a profit beyond the amount expended does not render the toll objectionable.[1768] The services of harbor masters for which fees are allowed must be actually rendered, and a law permitting harbor masters or port wardens to impose a fee in all cases is void.[1769] A State may not levy a tonnage duty to defray the expenses of its quarantine system,[1770] but it may exact a fixed fee for examination of all vessels passing quarantine.[1771] A State license fee for ferrying on a navigable river is not a tonnage tax, but rather is a proper exercise of the police power, and the fact that a vessel is enrolled under federal law does not exempt it.[1772] In the State Tonnage Tax Cases,[1773] an annual tax on steamboats measured by their registered tonnage was held invalid despite the contention that it was a valid tax on the steamboat as property.
KEEPING TROOPS
This provision contemplates the use of the State's military power to put down an armed insurrection too strong to be controlled by civil authority;[1774] and the organization and maintenance of an active State militia is not a keeping of troops in time of peace within the prohibition of this clause.[1775]