Horace Gray

“ The supervision of the admission of aliens into the United States may be intrusted by congress either to the department of state, having the general management of foreign relations, or to the department of the treasury, charged with the enforcement of the laws regulating foreign commerce; and congress has often passed acts forbidding the immigration of particular classes of foreigners, and has committed the execution of these acts to the secretary of the treasury, to collectors of customs, and to inspectors acting under their authority. ”

“ But, on the other hand, the final determination of those facts may be in trusted by congress to executive officers; and in such a case, as in all others, in which a statute gives a discretionary power to an officer, to be exercised by him upon his own opinion of certain facts, he is made the sole and exclusive judge of the existence of those facts, and no other tribunal, unless expressly authorized by law to do so, is at liberty to re-examine or controvert the sufficiency of the evidence on which he acted. ”

“ It is not within the province of the judiciary to order that foreigners who have never been naturalized, nor acquired any domicile or residence within the United States, nor even been admitted into the country pursuant to law, shall be permitted to enter, in opposition to the constitutional and lawful measures of the legislative and executive branches of the national government. ”