26 Wilson J at 161 also expressed the governing principle broadly. His Honour noted that legal professional privilege is grounded in public policy and that it would be odd if the privilege extended to protect communications that were 'directed against the public interest'. His Honour characterised communications which are themselves part of a criminal or unlawful proceeding and advice concerning proposed infractions of the law as examples of communications directed against the public interest. At 162 Wilson J observed:
'The privilege is the client's privilege, and it is the knowledge and purpose of the client which determines whether or not the privilege will attach to the communication. … No reason appears to suggest that the subject matter of her instructions to the solicitor, namely, a settlement of the matrimonial property, called for any secrecy to attach to her whereabouts. … Confidentiality was imperative in order to enable her to avoid discovery of herself and the child, and so continue her defiance of the order of the Court. To extend privilege to such a communication does nothing in the circumstances to facilitate "the perfect administration of justice". On the contrary, it enables the continuance of a contempt of court, and bears on its face the taint of illegality.'
27 In Attorney‑General (NT) v Kearney (1985) 158 CLR 500 ('Kearney') the High Court again found that the public interest required that certain communications not attract legal professional privilege. The communications in question in Kearney were confidential communications between officers of the Northern Territory Government and that government's legal officers. Those communications had been found to have been made in furtherance of a scheme to evade the operation of the Aboriginal Land Rights (Northern Territory) Act 1976 (Cth). Kearney was not a unanimous decision. The members of the court that constituted the majority held that communications made to further a deliberate abuse of statutory power with the intent to prevent others from exercising their rights under the law fell within the rule that denies privilege to communications made to further an illegal purpose. Gibbs CJ, with whom Mason and Brennan JJ agreed in this respect, at 515‑516 said:
'The law strikes a balance between securing proper representation by encouraging full disclosure on the one hand, and requiring the production of all relevant evidence on the other, but the balance more readily inclines in favour of disclosure where privilege from disclosure might conceal an abuse of delegated powers to enact legislation, and thus obstruct a proper challenge to the validity of part of the law itself. The basis of the privilege is not endangered if it is held that it does not protect communications made by a public authority for the purpose of obtaining advice or assistance to exceed its statutory powers.'
28 Wilson J at 524, after referring to authorities, including Ex parte Lees, expressed the relevant principle more broadly, observing that:
'The principle may be expressed by saying that, generally speaking, the public interest in the protection of alleged confidential professional communications will not be outweighed by the public interest in ensuring that all relevant evidence is admissible save when the professional relation is abused in a manner involving dishonesty that goes to the heart of the relationship. The presence of such dishonesty is enough to cause the privilege to "take flight" ….'
29 In Commissioner of Australian Federal Police v Propend Finance Pty Limited (1997) 188 CLR 501 ('Propend') a claim of legal professional privilege was upheld notwithstanding an allegation that the relevant communication was made for some illegal or improper purpose. The relevance of Propend for present purposes is the consideration contained in the judgments of the question of proof of an alleged illegal or improper purpose. Brennan CJ at 514 said:
'In determining whether a claim of legal professional privilege can be upheld, it is open to the party resisting the claim to show reasonable grounds for believing that the communication … for which legal professional privilege is claimed was made for some illegal or improper purpose, that is, some purpose that is contrary to the public interest. I state the criterion as "reasonable grounds for believing" because (a) the test is objective and (b) it is not necessary to prove the ulterior purpose ….
When a party in curial proceedings is seeking to rebut a claim of privilege by asserting that the communication with the legal adviser was made for an ulterior purpose, the evidence of ulterior purpose must be admissible in those proceedings.' (Citation omitted)
30 In Propend Toohey J, with whom Dawson J agreed, agreed with Brennan CJ that a party resisting a claim of legal professional privilege must place before the court evidence sufficient 'to give colour to the charge'. This expression seems to have been used first by Viscount Finlay in O'Rourke v Darbishire [1920] AC 581 at 604, where his Lordship said:
'If the communications to the solicitor were for the purpose of obtaining professional advice, there must be, in order to get rid of privilege, not merely an allegation that they were made for the purpose of getting advice for the commission of a fraud, but there must be something to give colour to the charge.'
31 At 534 Toohey J stated:
'There is no reason why hearsay material should be excluded. Indeed, the very nature of the exercise involved will often necessitate some hearsay evidence. If there is nothing more than hearsay the Court is unlikely to be persuaded to the required standard. But that is not to say that hearsay material must be disregarded.'
32 Gaudron J at 546‑547 said:
'If illegality were a true exception to legal professional privilege, it would be arguable that the person challenging the existence of the privilege should establish that the communication in question was made in furtherance of some illegal purpose. However, it is not a true exception and, thus, it is not necessary that illegality be established positively. On the other hand, a mere allegation of illegal purpose is not, itself, sufficient. There must be "not merely an allegation … of a fraud, but … something to give colour to the charge", "some prima facie evidence that it has some foundation in fact". The reason for this is obvious. Persons are presumed innocent, not guilty. And, thus, there must be evidence to raise a sufficient doubt as to a claim of privilege to cast a further evidentiary onus on the person making the claim to show that, in truth, the privilege attaches.
…
If a person wishes to resist a claim of privilege and to lead evidence of an illegal or other purpose inconsistent with its existence, that evidence must be in admissible form. Ordinarily, that will exclude hearsay.' (Citations omitted)
33 McHugh J at 556‑557 expressed views substantially identical with those expressed by Gaudron J in the above passage from her Honour's judgment, except that his Honour did not qualify his observation that hearsay evidence was inadmissible to displace a claim of legal professional privilege.
34 Gummow J, as we understand his Honour's judgment, adopted a stricter approach to the nature and extent of the evidence required to answer a claim of legal professional privilege where, as we interpolate is the present case, the existence of the privilege is one of the issues being tried on the hearing of the action. At 576 his Honour observed:
'In the present case, the question for decision by the trial judge was whether the appellants had made out a good answer to what otherwise would be a claim of privilege. … The issue did not arise upon judicial review of the decision of the Justice of the Peace [who had issued a warrant]. It arose at trial, … Attempts to put glosses upon the ordinary civil standard of proof which applied at the trial are to be discouraged.'
35 Kirby J at 593 expressed the position with regard to the admissibility of hearsay evidence as follows:
'Hearsay evidence may be relied upon to displace legal professional privilege where that privilege is claimed for materials alleged to have come into existence in furtherance of crime or fraud. But hearsay evidence alone, which amounts to no more than the assertion of what is suspected and sought to be proved, will not be sufficient to displace the privilege. Something more will be required to warrant the serious step of overriding the legal professional privilege and thus of depriving the client of the protections of such privilege. Something more was required in the facts of this case.'
36 We note that the judgment of the Federal Court that gave rise to the appeal to the High Court in Propend was delivered before the commencement of the Evidence Act 1995 (Cth) ('the Evidence Act').