A demand of the Minister upon the appellant bank for information of all transactions of one of its customers (the Union Bank of Switzerland) between 1 January 1955 and 31 December 1959 and production of documents relating to those transactions, was valid notwithstanding that the demand was not directed to the question of liability for taxation of the appellant and notwithstanding that the information sought would disclose private transactions in which a number of persons were involved who were not under investigation and might not be liable to tax. Cartwright J. stated (p. 1241):
"The purpose of the requirement, then, is to obtain information relevant to the tax liability of some specific person or persons whose liability to tax is under investigation; this is a purpose related to the administration or enforcement of the Act."