Republic Gear Company (Republic) brought a diversity action against Borg-Warner Corporation (Borg-Warner) in the United States District Court for the Northern District of Illinois in which Republic complains that Borg-Warner tortiously interfered with the contractual relations Republic had with two Brazilian corporations, Maquinas York S/A and Industrial Automobilistica Borton S/A (Borton).
Soon after commencing this action in Illinois Republic filed a notice with the United States District Court for the Southern District of New York to take the deposition for use in the Illinois proceeding of a New York City attorney, one Frank E. Nattier, Jr., as a non-party witness. Nattier was subpoenaed to bring with him to the deposition hearing any documents in his possession that might be relevant to the subject matter involved in Republic’s Illinois action. During the progress of the taking of his deposition Nattier refused to produce certain documents claimed by him to be within the attorney-client privilege and hence excludable under Fed.R.Civ.P. 26(b) from depositional examination. Nattier asserted the privilege on behalf of his clients Maquinas York and Borton, which he had professionally represented in 1959 when they terminated their contractual relations with Republic and began relations with Borg-Warner.
Twenty-eight months later Republic moved pursuant to Fed.R.Civ.P. 37(a) in the United States District Court for the Southern District of New York for an order compelling Nattier to comply with the subpoena’s direction to produce the documents. Republic claimed that the desired documents, consisting of correspondence between Nattier in New York and agents of the Brazilian companies and Republic, would reveal that Maquinas York and Borton had ceased relations with Republic because of inducements by Borg-Warner rather than, as had been stated to be the reason, because Republic had failed to supply necessary technical data required to be supplied by their contracts. Although Republic earlier had commenced actions against Maquinas York and Borton in the Southern District of New York, which actions were dismissed below for lack of jurisdiction over the defendants and which are now pending on appeal before this court, Maquinas York and Borton are not parties to the present Illinois litigation, nor, for all that appears in the record, have they expressly requested Nattier to assert claims of attorney-client privilege in their behalf in the present litigation. However, in Republic’s prior actions against the Brazilian companies these very documents sought to be here produced were previously determined to be within the attorney-client or the “work-produet” privileges by a Special Master appointed in those prior actions to supervise deposition proceedings and to rule on matters of privilege. In the present case the witness delivered the documents to the Chief Judge of the court below, and after a perusal of them Chief Judge Sugar-man determined, as had the Special Master in the other prior litigation, that they were protected from adversary disclosure in the suit Republic had commenced against Borg-Warner either as Nattier’s “work-product” or by the attorney-client privilege arising out of the *554 professional relationship between Nattier and his clients York and Borton. Republic’s motion was denied.
Appellant, maintaining that this order is a final decision of the district court below, has invoked our appellate jurisdiction pursuant to 28 U.S.C. § 1291. Borg-Warner has moved to dismiss the appeal on the ground that the order below is not a final decision and therefore not appealable. We deny the motion to dismiss and, upon review of the issue and an examination of the documents, affirm the order below.
In approaching a resolution of the motion to dismiss the appeal two factors must be kept in mind: the order was issued in a jurisdiction other than that in which the main case is pending, and the order denied the motion to compel disclosure.
Orders dealing with discovery have been held interlocutory and therefore unappealable, when issued in the same jurisdiction as that of the main proceeding, e. g., Horvath v. Letay,
Turning to the merits of this appeal, Republic urges that Nattier is not entitled to invoke the attorney-client privilege unless requested to do so by the clients whose confidential communications are sought to be protected, and either that the “work product” shelter is presently unavailable because the documents concerned were not prepared for this litigation, or there is “good cause” here to fashion an exception. Republic argues — and we shall assume for purposes of discussion that its argument is sound — that federal law governs the resolution of these questions, rather than the law of New York where the communications were made, the professional acts were performed, and where discovery is sought, or the law of Illinois, where the main diversity proceeding is pending. 2
*556
Republic, relying upon a pronouncement in a federal non-diversity case, supports its objection to Nattier’s assertion of the attorney-client privilege by quoting from the decision in United States v. United Shoe Machinery Corp.,
In addition to the exemplification of the rule just noted we also point out that under New York law an attorney is prohibited from divulging confidential communications in the absence of a waiver by his client, see N.Y.C.P.L.R. § 4503(a)
3
and so, too,
*557
under Illinois law, see In Re Busse’s Estate,
With reference to the documents shielded from discovery below as an attorney’s “work product,” we have found little authority as to whether the “work product” protection is restricted to materials prepared in connection with the very litigation in which the discovery is sought. The few lower court decisions in which disclosure was compelled dealt with material prepared for use in prior proceedings which had been fully completed before discovery was requested, see, e. g., Hanover Shoe, Inc. v. United Shoe Machinery Corp.,
Republic next contends that it has shown “good cause” for discovery of Nattier’s work product within the interpretation of Fed.R.Civ.P. 34 in Hickman v. Taylor,
Finally, we observe that the New York “work product” rule is one of qualified privilege modeled after Hickman v. Taylor, see N. Y. CPLR § 3101, Legislative Studies and Reports 8; Marco v. Sachs, supra
Appellant’s remaining contentions are without merit. 6 Accordingly, the judgment below is affirmed.
Notes
. Nattier, the non-party witness, contends that the acceptance of his claims of privilege by the Special Master in the earlier actions commenced by appellant against Nattier’s clients collaterally estops it from presently contesting his claim of privilege. Although collateral estoppel may bar relitigation of an issue even against different defendants, see James L. Saphier Agency, Inc. v. Green,
. Appellant maintains that federal law should be applicable because the question of admissibility of privileged communications is a procedural rather than a substantive question under Hanna v. Plumer,
We find it unnecessary to decide whether appellant’s argument is sound, for, as we point out infra at p. 557, any of the substantive rules of law that could be applicable here support [Nattier’s position. TBuLWYTfo not consider the question of attorney-client privilege to only a procedural question because, as we have previously stated, in this eir-' cuit a rule of privilege is “unlike the ordinary rules of practice which refer to the processes of litigation, in that it affects private conduct before the litigation arises.” Massachusetts Mutual Life Ins. Co. v. Brei,
Rules of privilege are not mere “housekeeping” rules which are “rationally capable of classification as either” substantive or procedural for purposes of applying the doctrine of Erie R. Co. v. Tompkins,
Our view that state rules on privilege are substantive for
Erie
purposes is not only supported by reason but also by the weight of authority, Massachusetts Mutual Life Ins. Co. v. Brei,
Appellant also assumes that the scope of protection of an attorney’s work product should be governed by federal law. However, that issue, too, is not before us. See infra p. 558.
An additional problem which we do not need to treat is that of whether, in a diversity discovery proceeding in one jurisdiction in aid of a diversity action in another, the state law where the main case is being adjudicated or the state law where the discovery proceeding is being held should govern the discovery proceeding.
. N.Y.C.P.L.R. § 4503(a) provides, in pertinent part: “Unless the client waives the privilege, an attorney or his employee, or any person who obtains without the knowledge of the client evidence of a confidential communication made between the attorney or his employee and the client in the course of professional employment, shall not disclose, or be allowed to disclose such communication * * *.”
. In Hickman v. Taylor,
. The dismissals of the previous actions brought by Rejrablic against Maquinas York and Borton in the Southern District of New York are presently pending on appeal to our court and, even if the dismissals are affirmed, the Brazilian corporations would still be subject to suit iu Brazil. Republic bas filed with us an “estoppel certificate” by which it agrees not to use any information obtained from Nattier against either of the Brazilian corporations, and argues that this completely protects them from being prejudiced by any information disclosed by Nattier. We point out, however, first that this certificate was not before Judge Sugarman and is not, therefore, part of the present appellate record. Dictograph Prod. Co. v. Sonotone Corp.,
. Nattier, in support of the motion to dismiss this appeal, filed an affidavit with us in which there is an indication that one of the two Brazilian companies has been dissolved. Republic accepts this as a factual statement though neither Nattier nor it identifies which of the two Brazilian companies may be the dissolved one, and, citing the Uniform Rules of Evidence, Rule 26(1), it argues that the attorney-client privilege was terminated by the dissolution of this company. We need not consider whether the privilege is so terminated, though we note that a dissolved corporation can sue and be sued in New York, see N.Y. Business Corporation Raw §§ 1006(a) (4), (b), and 1311, for this motion was not before the court below. Dictograph Prod. Co. v. Sonotone Corp.,
