Summary

Portrait of Felix Frankfurter Felix Frankfurter Perez v. Brownell — Opinion of the Court

It cannot be said, then, that Congress acted without warrant when, pursuant to its power to regulate the relations of the United States with foreign countries, it provided that anyone who votes in a foreign election of significance politically in the life of another country shall lose his American citizenship. To deny the power of Congress to enact the legislation challenged here would be to disregard the constitutional allocation of governmental functions that it is this Court's solemn duty to guard.
Source: Wikisource

Portrait of Felix Frankfurter Felix Frankfurter Perez v. Brownell — Opinion of the Court

The States that joined together to form a single Nation and to create, through the Constitution, a Federal Government to conduct the affairs of that Nation must be held to have granted that Government the powers indispensable to its functioning effectively in the company of sovereign nations. The Government must be able not only to deal affirmatively with foreign nations, as it does through the maintenance of diplomatic relations with them and the protection of American citizens sojourning within their territories.
Source: Wikisource

Portrait of Felix Frankfurter Felix Frankfurter Perez v. Brownell — Opinion of the Court

We cannot deny to Congress the reasonable belief that these difficulties might well become acute, to the point of jeopardizing the successful conduct of international relations, when a citizen of one country chooses to participate in the political or governmental affairs of another country. The citizen may by his action unwittingly promote or encourage a course of conduct contrary to the interests of his own government
Source: Wikisource

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