Summary

Portrait of Hugo Black Hugo Black Hines v. Davidowitz — Opinion of the Court

Little aid can be derived from the vague and illusory but often repeated formula that Congress 'by occupying the field' has excluded from it all state legislation. Every Act of Congress occupies some field, but we must know the boundaries of that field before we can say that it has precluded a state from the exercise of any power reserved to it by the Constitution. To discover the boundaries we look to the federal statute itself, read in the light of its constitutional setting and its legislative history.
Source: Wikisource

Portrait of Hugo Black Hugo Black Hines v. Davidowitz — Opinion of the Court

At a time when the exercise of the federal power is being rapidly expanded through Congressional action, it is difficult to overstate the importance of safeguarding against such diminution of state power by vague inferences as to what Congress might have intended if it had considered the matter or by reference to our own conceptions of a policy which Congress has not expressed and which is not plainly to be inferred from the legislation which it has enacted.
Source: Wikisource

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