disclosure to the Internal Revenue Service.
In support of his claim of privilege McKay relies upon Hickman v. Taylor, 1947, 329 U.S. 495, 67 S.Ct. 385, 91 L.Ed. 451. In the Hickman case the Supreme Court had occasion to consider the attorney-client privilege. The Court held that under the discovery provisions of the Federal Rules of Civil Procedure the memoranda, statements and mental impressions prepared or obtained from interviews with witnesses by counsel in preparing for litigation, commonly called the work product of the lawyer, while not within the attorney-client privilege, are nonetheless, as a matter of general policy and in the interest of the orderly working of our system of legal procedure, privileged from disclosure to the opposing party unless adequate cause his shown to invade the privacy of counsel.
We think the power of the Commissioner of Internal Revenue to investigate the records and affairs of taxpayers is greater than that of a party in civil litigation. His power has been characterized by this court as an inquisitorial power, analogous to that of the grand jury and one which should be liberally construed. Falsone v. United States, 5 Cir. 1953, 205 F.2d 734, 742, cert. den. 346 U.S. 864, 74 S.Ct. 103, 98 L.Ed. 375. In such context, the criteria of relevancy and materiality have broader connotations than in the context of trial evidence. Schwimmer v. United States, 8 Cir. 1956, 232 F.2d 855, 862, cert. den. 352 U.S. 833, 77 S.Ct. 48, 1 L.Ed.2d 52. As was said in Bolich v. Rubel, 2 Cir. 1933, 67 F.2d 894, 895, these inquisitorial powers are justified “because all the facts are in the taxpayer’s hands.” Accordingly, the relevancy of the work product privilege enunciated in the Hickman case to a proceeding for the enforcement of the Commissioner’s summons may well be doubted. Certainly the Federal Rules of Civil Procedure, while applicable to the proceeding in the district court, do not apply to the proceeding in the Commissioner’s office. Falsone v. United States, 5 Cir. 1953, 205 F.2d 734, 741-742, cert. den. 346 U.S. 864, 74 S.Ct. 103, 98 L.Ed. 375. And it has been held that cause need not be shown by the Commissioner as a condition to his issuing a summons in the course of re-examining a tax return. United States v. Powell, 1964, 379 U.S. 48, 85 S.Ct. 248, 13 L.Ed. 2d 112.
But even if it be assumed that the rule of the Hickman case might be applicable to the issuance of such a summons it is clear that a report prepared by appraisers, such as is here involved, is not privileged from disclosure either under the attorney-client privilege or as the work product of the lawyer. As to the former the Supreme Court said in the Hickman case (329 U.S. p. 508, 67 S.Ct. p. 392):
“We also agree that the memoranda, statements and mental impressions in issue in this case fall outside the scope of the attorney-client privilege and hence are not protected from discovery on that basis. It is unnecessary here to delineate the content and scope of that privilege as recognized in the federal courts. For present purposes, it suffices to note that the protective cloak of this privilege does not extend to information which an attorney secures from a witness while acting for his client in anticipation of litigation. Nor does this privilege concern the memoranda, briefs, communications and other writings prepared by counsel for his own use in prosecuting his client’s case; and it is equally unrelated to writings which reflect an attorney’s mental impressions, conclusions, opinions or legal theories.”
And with respect to the latter the Court said (pp. 511-512, 67 S.Ct. p. 394):
“We do not mean to say that all written materials obtained or prepared by an adversary’s counsel with an eye toward litigation are necessarily free from discovery in all cases. Where relevant and non-privileged facts remain hidden in an attorney’s file and where production of those facts is essential to the preparation of one’s