The power to legislate with respect to incidental matters has always been applied flexibly and liberally, as it must in a Constitution, but it cannot authorize legislation upon matters which are prima facie within the province of the States upon grounds of a connection with Federal affairs that is only tenuous, vague, fanciful or remote. Is a sufficient connection with the operations, functions, security or other concern of the Federal Government shown or indicated by the words "so as to endanger the peace, order or good government of the Commonwealth"? I find myself at a loss to know what specific element in the crime these words describe. They are obviously taken from s. 51, but the conjunction "and" is changed to "or." When s. 51 says "The Parliament shall have power to make laws for the peace, order and good government of the Commonwealth, with respect to - " the section employs traditional words used in many constitutions to confer plenary powers over named territories. They occur in s. 91 of the British North America Act 1867, and no doubt this was their more immediate source. But there the words serve a purpose. For if a measure does not fall within the matters assigned by s. 92 to the Provinces, the Parliament of the Dominion, under the general power to make laws for the peace, order and good government of Canada, may obtain authority to enact it (Russell v. The Queen [1] ). There is a long list in Quick & Garran on the Constitution of the Australian Commonwealth, at pp. 511, 512 , of Imperial Acts conferring constitutions on Colonies and Dominions containing the same or similar words. The list begins with the Quebec Act 14 Geo. III c. 83, s. 12, and ends with the British North America Act 1867. To the list there should be added the South Africa Act 1909, s. 59 of which enacts that the Parliament of the Union shall have full power to make laws for the peace, order and good government of the Union. In s. 51 of the Commonwealth Constitution the words appear to have been understood as giving a plenary character, within their ambit, to the powers over the specific subject matters afterwards enumerated (cf D'Emden v. Pedder [2] and Amalgamated Society of Engineers v. Adelaide Steamship Co. Ltd. [3] , per Higgins J.). In Attorney-General for the Commonwealth v. Colonial Sugar Refining Co. [4] , Lord Haldane seems to imply the same thing: - "The section [i.e. s. 51] commences by declaring that the Parliament of the Commonwealth shall, subject to the new Constitution, have power to make laws for the peace, order, and good government of the Commonwealth. But this power is not conferred in general terms. It is, unlike the corresponding power conferred by s. 91 of the Canadian Constitution Act of 1867, restricted by the words which immediately follow it. These words are "with respect to," and then follows a list of enumerated specific subjects". The words "of the Commonwealth" may operate to confine the exercise of the legislative powers in respect of the matters which follow to Australia territorially or by reference to "the Commonwealth." But otherwise there is nothing restrictive in the entire phrase, the amplitude of which is itself restricted, as the foregoing passage shows, by the enumeration which follows. Which of the various meanings of the word "Commonwealth" should be given to the word in the context is perhaps open to dispute. " the term is in fact used in several senses connected so closely that it is peculiarly important to distinguish them. First, it is as already explained, the territorial community, the "single entity," the "new State or nation," established under the Act (e.g., secs. iii and iv.). Secondly, it describes the territory occupied by that community (e.g., sec. 95). Thirdly, it describes the Federal Government or some appropriate organ thereof. It is in this sense that prohibitions to make laws of various kinds (e.g., secs. 99, 100, 114, 116) are to be understood; they are addressed to the Parliament as the legislative organ of Federal Government; the prohibition does not bind the Commonwealth as a political organism, for the Constitution may be amended by the Commonwealth": Sir W. Harrison Moore, Commonwealth of Australia, 2nd ed., at p. 73 . Probably the word should be understood in s. 51 territorially or, what has much the same result, as referring to the community united as a nation. When the disjunctive "or" is substituted for "and," it seems to make no real alteration in the meaning of the phrase. It points perhaps to the necessity of considering separately or distributively the elements that go to make up the welfare of the people. But that is all. The words are in my opinion incapable of any definite meaning which would provide the necessary connection with the subjects of Federal power, with the administration of the Federal Government or with the security of any of its institutions. They are as large as the practically identical words in s. 51 which are larger than the enumerated legislative powers of the Parliament. It is true that in America currency has been given to the expression the "peace of the United States." Brewer J. spoke of the power of the Government of the United States to command obedience to its laws and hence to keep the peace to that extent (Ex parte Siebold [1] ). In In re Neagle [2] , Miller J., perhaps taking up these words, said, - "That there is a peace of the United States; that a man assaulting a judge of the United States while in the discharge of his duties violates that peace; that in such case the marshal of the United States stands in the same relation to the peace of the United States which the sheriff of the county does to the peace of the State of California; are questions too clear to need argument to prove them." The proposition seems to be little else than a striking way of saying that an opposition to the execution of the law of the United States or any violence exhibited to officers of the United States in the course of their duty may be lawfully met under Federal authority with any necessary force and that the commonlaw duties of officers of the law and no doubt of the citizen to render assistance attach in the same way as they do under State law. The result is that, as in In re Neagle [1] , the justification of a Federal officer who has used force for the purpose is considered to arise under Federal law.