[Sidenote: Essential Difference between Original and Vicarious Responsibility.]
§ 150. It is, however, obvious that original and vicarious State responsibility are essentially different. Whereas the one is responsibility of a State for a neglect of its own duty, the other is not. A neglect of international legal duties by a State constitutes an international delinquency. The responsibility which a State bears for such delinquency is especially grave, and requires, apart from other especial consequences, a formal expiatory act, such as an apology at least, by the delinquent State to repair the wrong done. On the other hand, the vicarious responsibility which a State bears requires chiefly compulsion to make those officials or other individuals who have committed internationally injurious acts repair as far as possible the wrong done, and punishment, if necessary, of the wrongdoers. In case a State complies with these requirements, no blame falls upon it on account of such injurious acts. But of course, in case a State refuses to comply with these requirements, it commits thereby an international delinquency, and its hitherto vicarious responsibility turns _ipso facto_ into original responsibility.
STATE RESPONSIBILITY FOR INTERNATIONAL DELINQUENCIES
See the literature quoted above at the commencement of § 148.
[Sidenote: Conception of International Delinquencies.]
§ 151. International delinquency is every injury to another State committed by the head and the Government of a State through violation of an international legal duty. Equivalent to acts of the head and Government are acts of officials or other individuals commanded or authorised by the head or Government.
An international delinquency is not a crime, because the delinquent State, as a Sovereign, cannot be punished, although compulsion may be exercised to procure a reparation of the wrong done.
International delinquencies in the technical sense of the term must not be confounded either with so-called "Crimes against the Law of Nations" or with so-called "International Crimes." "Crimes against the Law of Nations" in the wording of many Criminal Codes of the single States are such acts of individuals against foreign States as are rendered criminal by these Codes. Of these acts, the gravest are those for which the State on whose territory they are committed bears a vicarious responsibility according to the Law of Nations. "International Crimes," on the other hand, refer to crimes like piracy on the high seas or slave trade, which either every State can punish on seizure of the criminals, of whatever nationality they may be, or which every State has by the Law of Nations a duty to prevent.