Summary

William Strong Union Pacific Railroad Company v…

They grow out of our complex system of government, and out of the fact that the authority of the National government is legitimately exercised within the States. While it is true that government cannot exercise its power of taxation so as to destroy the State governments, or embarrass their lawful action, it is equally true that the States may not levy taxes the direct effect of which shall be to hinder the exercise of any powers which belong to the National government. The Constitution contemplates that none of those powers may be restrained by State legislation.
Source: Wikisource

William Strong Union Pacific Railroad Company v…

It is, therefore, manifest that exemption of Federal agencies from State taxation is dependent, not upon the nature of the agents, or upon the mode of their constitution, or upon the fact that they are agents, but upon the effect of the tax; that is, upon the question whether the tax does in truth deprive them of power to serve the government as they were intended to serve it, or does hinder the efficient exercise of their power. A tax upon their property has no such necessary effect. It leaves them free to discharge the duties they have undertaken to perform.
Source: Wikisource

William Strong Union Pacific Railroad Company v…

And the same is true of the corporate agent. If 'the tax be upon its operations, and consequently upon the operation of an instrument empowered by the government of the Union, to carry its powers into execution,' then the tax is unconstitutional. The reason of the rule marks its limitations. The National government must be free to use such means as it selects, to carry out its functions, else it cannot exist. When a State tax impairs the efficiency of any instrumentality which Congress selects to carry out the legitimate purposes of the Federal government, it is unconstitutional.
Source: Wikisource

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