It is to be observed from the report of Prigg’s case that Pennsylvania, by her attorney-general, pressed the argument that the obligation to surrender fugitive slaves was on the States and for the States, subject to the restriction that they should not pass laws or establish regulations liberating such fugitives; that the Constitution did not take from the States the right to determine the status of all persons within their respective jurisdictions; that it was for the State in which the alleged fugitive was found to determine, through her courts or in such modes as she prescribed, whether the person arrested was, in fact, a freeman or a fugitive slave; that the sole power of the general government in the premises was, by judicial instrumentality, to restrain and correct, not to forbid and prevent in the absence of hostile State action; and that for the general government to assume primary authority to legislate on the subject of fugitive slaves, to the exclusion of the States, would be a dangerous encroachment on State sovereignty. But to such suggestions this court turned a deaf ear, and adjudged that primary legislation by Congress to enforce the master’s right was authorized by the Constitution. We next come to the Fugitive Slave Act of 1850, the constitutionality of which rested, as did that of 1793, solely upon the implied power of Congress to enforce the master’s rights. The provisions of that act were far in advance of previous legislation. They placed at the disposal of the master seeking to recover his fugitive slave, substantially the whole power of the nation. It invested commissioners, appointed under the act, with power to summon the _posse comitatus_ for the enforcement of its provisions, and commanded all good citizens to assist in its prompt and efficient execution whenever their services were required as part of the _posse comitatus_. Without going into the details of that act, it is sufficient to say that Congress omitted from it nothing which the utmost ingenuity could suggest as essential to the successful enforcement of the master’s claim to recover his fugitive slave. And this court, in _Ableman ~v.~ Booth_, 21 How. 506, adjudged it to be “in all of its provisions fully authorized by the Constitution of the United States.”