The definition of industrial dispute contained in s. 4 (1) of the Act says that the expression shall include a dispute in relation to employment in an industry carried on by or under the control of the Commonwealth or an authority of the Commonwealth whether or not the dispute extends beyond the limits of any one State. "Industry" is defined to include an undertaking of employers and a branch of an industry. Qantas Empire Airways Ltd. is a company incorporated under the company legislation of Queensland and all the shares except seven are held by the Commonwealth: the seven shares are held by nominees of the Commonwealth. Under the articles of association the Minister of State for Civil Aviation has the sole right of appointing the directors of the company. The undertaking of the company consists of extensive international airlines and it is in connexion with that undertaking that the pilots or the Australian Federation of Air Pilots are said to be in dispute with Qantas Empire Airways Ltd. It might be suggested that, having regard to the facts stated, the undertaking formed an "industry carried on under the control of the Commonwealth" within the definition and that all that remained was to consider whether pilots were in dispute with their employer. However counsel for Qantas Empire Airways Ltd. declined to put his case on that basis. His contention in showing cause against the order was that an industrial dispute existed extending beyond the limits of any one State, as found by the Commissioner. Prima facie this raises a question of fact. It is true that s. 60 (2) of the Act purports to give a conclusive effect in all courts to a determination or finding that such a dispute exists made by the "Commission", a word which may include the Commissioner exercising the function in which he made the finding: see s. 6 (1), the definition of the Commission in s. 4 (1) and ss. 23, 28, 29, 32 and reg. 17 of the Conciliation and Arbitration Regulations. But of course the existence of an industrial dispute extending beyond the limits of any one State is under the Constitution a jurisdictional fact which on prohibition cannot be controlled by the finding of the tribunal against which the writ of prohibition is sought. Very briefly stated the material facts appear to be as follows. An organization of employees registered under the Act existed, called the Australian Air Pilots' Association. An agreement, certified under s. 31, with this organization, called the Airline Pilots' Agreement 1956, governed the salaries and conditions of employment of the air pilots employed by Qantas Empire Airways Ltd. and also those of other companies by which airlines are conducted in Australia. The members however resigned from this organization and formed the Australian Federation of Air Pilots as a voluntary association not registered under the Act. This took place in 1959 and in a letter dated 6th August 1959 signed by the Manager of the Federation the latter informed the Chairman of the Australian Airlines Operators' Association of the number of the members of the Federation in the employ of each of the members of the Operators' Association, and proffered an assurance that the Federation's elected officers were authorized to act in all matters in a manner approved by the elected governing body and, with its approval, to make decisions binding on the individual membership. The Constitution and By-Laws of the Federation contain a very full and detailed charter for setting up the body, defining its purposes, establishing its committees and officers and regulating the conduct of its affairs. One of its principal objects is stated to be to protect and further the interests of air pilots and to safeguard and improve the interests and rights of members of the Federation, and another includes the improvement of the terms and conditions of their employment. The officers include a President, a Manager and a Director Industrial as well as a Treasurer-Secretary and other usual officers. The officers are elected by secret ballot at a Convention which is the supreme authority and is held annually. But there is an Executive Committee consisting of the office-bearers of the Federation and a representative of each Branch Committee elected by the Branch Committee. The Executive Committee controls the general management and business affairs of the Federation. The Manager, who is appointed by the President from candidates chosen by the Convention, is empowered among other things to carry out all routine business of the Federation necessary for the furtherance of the objects of the Federation in accordance with the rules. The Director Industrial is to "function in co-operation with the President and the Manager in all matters particularly appertaining to the industrial affairs of the Federation" and is to assist to his utmost in the pursuit of the industrial objectives and policies laid down by the Convention and the Executive Committee. Prior to the Annual Convention in each year the Executive Committee is required to prepare suggested variations of the employment contract for negotiation. It must appoint officers to represent the Federation at all negotiations. They must report twice a week to the Executive Committee. The President, Director Industrial and the Manager are the authorized officers to sign employment contracts on behalf of the membership and their signature is to be binding on the membership concerned. A branch of the Federation is deemed to exist in every State and in the Territory of Papua and New Guinea, when fifteen members are permanently domiciled in the State or Territory.