This is a relator's action brought in the original jurisdiction of this Court in the name of the Attorney-General for the State of Victoria against the Commonwealth. The purpose of the proceeding is to obtain a declaration that in carrying on a clothing factory established by the Commonwealth, the making or supplying of uniforms and clothing is beyond the powers of the Executive in so far as persons outside the Commonwealth services are supplied. The clothing factory was established primarily for the purpose of supplying soldiers' and sailors' uniforms, and uniforms required in the civil services of the Commonwealth. The relator's contention is that, in the course of the operations, the factory cannot without an excess of power, supply the requirements of the States or of municipalities, or of other persons or bodies. The relator, the Victorian Chamber of Manufactures, obtained a fiat from the Attorney-General for the State of Victoria for the present proceedings, which arise, no doubt, out of a desire to suppress the competition of the factory, such as it is. An objection is taken on behalf of the Commonwealth that the action is incompetent, because the matters complained of afford no ground of action, even if the operations of the factory were to the extent alleged beyond the powers of the Commonwealth. In considering this objection, the fact that it is a relator's action is immaterial. When the Attorney-General's fiat has been obtained, the action in his name is as competent or incompetent as if it were brought ex officio by him. The question, therefore, is whether, assuming ultra vires, the Attorney-General of a State can maintain an action against the Commonwealth to obtain a declaration and consequential relief against the Commonwealth's ultra vires activity. In my opinion he can. To a great extent the question is settled by Attorney-General (N.S.W.) v. Brewery Employes Union of New South Wales[4] and Tasmania v. Victoria[5]. In my own judgment (ante, p. 171) I said: - "In a matter of public right the Attorney-General sues on behalf of the public. There is no reason why his right to do so should be confined to matters of exclusively domestic concern. On the contrary, there is every reason in a Federal system that this principle should be applied to allow him to maintain proceedings to vindicate the rights conferred upon his public by a provision of the Constitution." If the Commonwealth Executive is engaged in trading operations in competition with the citizens of a State so that the public of the State are affected by acts of the Executive, and it appears that in so trading the Commonwealth is acting without any legal warrant because under the Federal system such activities could only be carried on by the State if the Crown is to pursue them at all, I think these principles apply. In the case supposed the citizens of the State are affected as such because the power exercisable in reference to them only by the State Government is assumed by the Federal Government. The Attorney-General of the State may properly represent them just as he would represent them in a unitary system if a statutory corporation exceeded its powers by a similar course of action. It was next said that even so the facts of the present case presented no matter within the meaning of the word as used in sec. 75 of the Constitution. This argument again assumed, as of course it must do, that the complaint of ultra vires is well founded. It is based upon the notion that the operations of the clothing factory can violate no right, that no one can have a claim of right to prevent them. Even if this were correct the argument would in my opinion involve a confusion, because whether a question amounts to a matter does not depend upon the legal plausibility of a claim of right made, but upon the making of it. When the Attorney-General of a State at the instance of relators claims to restrain the Federal Government from continuing a course of action it has adopted, it seems odd to say that the claim, because misconceived, is not a matter. If the Court did not agree that it was misconceived and acceded to the claim, it could hardly be said that it acted without jurisdiction. The real question in the case is whether the Commonwealth Executive is acting beyond its powers. It cannot be doubted that under the Constitution the legislative power of Parliament enables it to authorize the Executive to establish and conduct a clothing factory to supply all the needs of the Commonwealth Government, whether Naval and Military or Civil. As at present advised I am not prepared to accede to the argument that, without legislative power, the Commonwealth Executive can enter into business operations simply because it is a juristic entity, and in conducting business is not exercising governmental power over the subject. In the present case the factory was established pursuant to legislation of the Parliament, namely, secs. 63 and 64 of the Defence Act. These provisions do not, it need hardly be said, exceed the defence power. But how far does it extend? It must be construed subject to the Constitution (see sec. 15A_Acts Interpretation Act 1901-1933_). So construed, does it extend to the use of the factory for requirements which are not strictly naval, military, civil or otherwise departmental? I have no doubt that to fulfil these requirements must be the primary purpose of the factory. But it must be remembered that they are of a fluctuating character. All things naval and military have the possibility of war in view, and the nature of the factory cannot be determined by peace-time requirements. A doctrine exists in the case of trading corporations that, when for the purpose of their undertakings they must control property, premises or appliances, it is within their incidental powers to utilise them for purposes akin to and not inconsistent with the primary purpose of the corporation, and thus avoid the ill consequences of their being left vacant, idle and unemployed. (See Brice on Ultra Vires, 3rd ed. (1893), p. 135; Simpson v. Westminster Palace Hotel Co.[6].) The question how far this doctrine is to be pushed in relation to corporations is one of degree, and has excited some difference of opinion (Forrest v. Manchester, Sheffield and Lincolnshire Railway Co.[7], and on appeal[8]). It illustrates an application of the general doctrine that things may be done which are fairly incidental or conducive to the purpose for which a power is enjoyed. On the whole I think we may apply it to the peculiar situation in which the Commonwealth Clothing Factory stands. The case was ordered to be argued before us on the pleadings, mutual admissions and exhibits thereto, and on the Commonwealth Statutory Rule No. 210 of 1926. It might, perhaps, have been more satisfactory if, for the purpose of our decision, the facts had been investigated in detail on the trial of the action. In all cases where incidental powers are relied upon there is a danger of the cart being harnessed before the horse. In the present case, however, so far as I can see, there is no inversion of the main and incidental power, and the supply to outsiders is of a minor character, and subsidiary to the main purpose of keeping a factory in going order for naval and military purposes on a scale adequate for actual and potential demand. In my opinion the action should be dismissed upon the ground that in substance the complaint is ill-founded.