In June, 1982, a Norfolk County grand jury indicted the defendant, Lawrence Goldman, for conspiracy to murder a former Boston police officer named John Glenn. When it became apparent that the Commonwealth would call Glenn as a witness at the defendant’s trial, defense counsel, Mr. Willie J. Davis, filed a motion in limine seeking a pretrial ruling on a question concerning the attorney-client privilege. Following a hearing, a Superior Court judge made certain findings of fact and ruled on the motion. She then reported to the Appeals Court four questions raised by the motion. See Mass. R. Crim. P. 34,
We summarize the facts as found by the judge. In January, 1982, Glenn made an unsuccessful attempt to murder an individual named Leo Shorter. The Commonwealth theorizes that the defendant, a codefendant in this case named John Miskel, and others hired Glenn to kill Shorter because Shorter had cheated the defendant in a drug deal. A Norfolk County grand jury indicted Glenn for assault with intent to murder Shorter. Shortly after his arraignment in January, 1982, Glenn met with Mr. Davis concerning the possibility of Mr. Davis’s representing Glenn. Glenn and Mr. Davis discussed the indictment; Glenn gave confidential information about the case to Mr. Davis. They reached no agreement, however, concerning Mr. Davis’s representation of Glenn, and Mr. Davis did not represent Glenn at his trial.
Following a trial in the Superior Court in Norfolk County, Glenn was convicted. His sentencing has been continued pending his testimony in the instant case. In this case, the Commonwealth alleges that, after Glenn’s unsuccessful attempt to kill *497 Shorter, the defendant conspired with Miskel to kill Glenn, and that Miskel unsuccessfully attempted to kill Glenn. 1
After Mr. Davis filed the motion in limine, the judge held an in camera hearing at which Mr. Davis testified as to the substance of his conversation with Glenn. 2 Based on the testimony and exhibits, the judge found that in March, 1983, after his conviction, Glenn began to cooperate with the Commonwealth concerning his association with Miskel, the defendant, and others. Glenn gave statements relative to the attempt on the life of Shorter to officers of the Quincy police department. These statements were recorded, and, later, a transcription of them was made available to Mr. Davis as counsel for the defendant. The statements Glenn made to Mr. Davis are “diametrically opposed” to those which Glenn gave to Quincy police officers. Glenn is a key prosecution witness, and his credibility will be a central issue in the upcoming trial. Glenn’s statements to Mr. Davis could be viewed by a reasonable juror as seriously damaging Glenn’s credibility if he should testify in accordance with his taped statements. Glenn invokes the attorney-client privilege with respect to his conversation with Mr. Davis and refuses to waive it. Glenn has indicated his continuing intention not to waive the privilege.
The judge reported the following questions:
“1. Whether a witness waives the attorney-client privilege in regard to confidential communications previously made to an attorney concerning certain events, now the subject matter of this trial, when that witness takes the stand at trial and gives testimony as to those events, but specifically refuses to waive the attorney-client privilege as to the confidential communications.
“2. If not, whether the privilege should be overridden in the interest of justice.
*498 “3. Whether defendant’s attorney, to whom the Commonwealth’s witness previously made confidential communications is required to withdraw because of the conflict of interest [which would] be inherent in his (the attorney’s) continued representation of the defendant.
“4. Whether the defendant can voluntarily, knowingly, and intelligently consent to the continued representation by his attorney despite the conflict of interest where, because of the attorney-client privilege, full disclosure cannot be made by counsel to the defendant.” 3
We hold that, by testifying in the instant case, Glenn does not automatically waive the attorney-client privilege concerning his conversation with Mr. Davis, and that, on this record, justice does not require that the privilege be overridden. Although a genuine conflict of interest exists which may require withdrawal by Mr. Davis, the defendant may consent to his continued representation by Mr. Davis, so long as his consent is voluntarily, knowingly, and intelligently made.
1.
Waiver of attorney-client
privilege.
4
For over a century, Massachusetts case law has been in conflict on the issue whether a witness waives the attorney-client privilege when testifying.
Neitlich
v.
Peterson,
The court next relied on the doctrine established in
Woburn
in
Commonwealth
v.
Barronian,
The contrary line of cases, holding that a witness’s taking the stand, by itself, does not produce a wholesale waiver of the privilege, began with
Montgomery
v.
Pickering,
In his argument the defendant apparently confuses two distinct scenarios. In the first, a witness testifies as to events *500 which happen to have been a topic of a privileged communication. In the second, the witness testifies as to the specific content of an identified privileged communication. We believe that the privilege is not waived in the first example, and we decline to follow that line of cases, based on Woburn v. Henshow, supra, which appear to be to the contrary. A waiver may be found, however, where the client testifies as to the content of a privileged communication. Neitlich v. Peterson, supra at 626-627. See Montgomery v. Pickering, supra. Cf. Proposed Mass. R. Evid. 510 (1980). 6
“[T]estimony about an event . . . should not be construed as a waiver of the privilege, merely because the subject matter of the testimony may also have been discussed in the privileged communication,”People v. Lynch, 23 N. Y.2d 262,271 (1968); waiver of the attorney-client privilege should not be implied from a witness’s taking the stand. See People v. Shapiro, 308 *501 N.Y. 453, 457-460 (1955). Glenn is expected to testify about certain events which took place, not about the specifics of his conversation with Mr. Davis. Such testimony cannot be considered a waiver of the attorney-client privilege. 7
The defendant argues, however, that, even where there is no waiver of the privilege, the interests of justice require that it be overridden. Apropos of the defendant’s argument is the rule set forth in Annot.,
Nevertheless, the policy justifications for the attorney-client privilege override the reasoning of the court in
Jones
and support the judge’s conclusion that, on this record, the privilege
*502
should not yield in the interest of justice.
8
The privilege operates to protect disclosures which might not have been made absent the privilege.
Fisher
v.
United States,
In conclusion, we choose to follow the rule stated in 8 J. Wigmore, Evidence § 2327, at 637 (McNaughton rev. 1961): “The client’s offer of his
own testimony
in the cause
at large
is not a waiver for the purpose either of cross-examining him to the communications or of calling the áttomey to prove them. Otherwise the privilege of consultation would be exercised only at the penalty of closing the client’s own mouth on the stand.” (Emphasis in original.) See
Littlefield
v.
Superior Court,
*503 2. Conflict of interest. The defendant argues that, should we hold that Glenn does not waive the attorney-client privilege by testifying, no conflict of interest arises. He maintains that ethical considerations present themselves only if Mr. Davis testifies, and is then faced with arguing his own credibility. We disagree. Mr. Davis will face a genuine conflict of interest in his cross-examination of Glenn.
A conflict of interest arises whenever an attorney’s regard for one duty leads to disregard of another.
United States
v.
Miller,
*504
During cross-examination of Glenn, Mr. Davis will confront a genuine conflict of interest. On behalf of the defendant, Mr. Davis will likely cross-examine Glenn in an effort to impeach his credibility. During this cross-examination, Mr. Davis must avoid using any confidential information which he may have obtained from Glenn in their privileged conversation of January, 1982. “The conflict [thus] engendered in the attorney’s own mind may have unmeasurable adverse effects on the client’s interests.”
Commonwealth
v.
Rondeau,
*505
Mr. Davis correctly brought this matter to the judge’s attention so that the issue could be resolved in a pretrial posture. Cf.
Commonwealth
v.
Michel,
3.
Waiver of right to an attorney with undivided loyalty.
The Superior Court judge noted that the defendant has indicated a desire to waive representation by an attorney with undivided loyalty. A defendant’s right to have the effective assistance of counsel, guaranteed by the Sixth Amendment to the Constitution of the United States, contemplates that the assistance be “untrammeled and unimpaired . . . free of any conflict of interest and unrestrained by commitments to others.”
Commonwealth
v.
Davis,
376 Mass.
Ill,
780-781 (1978).
Glosser
v.
United States,
The judge ruled that, although an argument can be made that the defendant’s waiver may be voluntary, the defendant cannot make a “knowing and intelligent” waiver; because the information is privileged, the defendant cannot know what the information is and, therefore, cannot know how his defense will be affected. We think that this ruling is incorrect. The defendant need not know the exact content of the privileged communication to make an informed decision. Presumably, the defendant will be informed that Glenn’s anticipated testimony is “diametrically opposed” to the privileged communication, and from that basis the defendant will be able to extrapolate any effect that Mr. Davis’s constrained cross-examination will have on his defense.
*507
Before remanding the case to the Superior Court, we discuss the conditions under which a judge properly may find that a defendant has waived the right to an attorney with undivided loyalty. First, a finding of waiver of a constitutional right to counsel should not be made lightly. See
Commonwealth
v.
Cavanaugh,
Thus, the judge should require that the defendant receive a full disclosure of the conflict and its projected ramifications.
13
The judge actively should participate in the waiver decision, seeking “to elicit a narrative response from [the] defendant that he has been advised of his right to effective representation, that he understands the details of his attorney’s . . . conflict of interest and the potential perils of such a conflict, that he has discussed the matter with his attorney or if he wishes with outside counsel, and that he voluntarily waives his Sixth Amendment protections.”
14
United States
v.
Garcia,
*508
A record of the waiver colloquy between the defendant and the judge should be made in which the language of the waiver is clear, unequivocal, and unambiguous. Such a record should help shield any potential conviction from collateral attack on Sixth Amendment grounds. See
Commonwealth
v.
Wooldridge,
Finally, in a rare instance, in ruling on the validity of a defendant’s waiver, the trial judge may take into account, aside from the rights of the defendant, the interests of the court in the “fair and proper administration of justice.”
Connor, supra
at 504. Counsel’s undivided loyalty to the client is crucial to the integrity of the entire adversary system.
Commonwealth
v.
Leslie, 316
Mass. 647, 652 (1978), cert. denied,
So ordered.
Notes
The defendant and Miskel also have been indicted on charges arising out of Glenn’s attempt on Shorter’s life.
We make no comment on the propriety of such an in camera disclosure of privileged communications absent the consent of the client.
In ruling on the motion, the judge answered these questions as follows: (1) “No”; (2) “No”; (3) “Yes”; (4) “No.” Consequently, she ordered that Mr. Davis withdraw as the defendant’s counsel.
We note that Mr. Davis does not dispute that the statements made by Glenn to him in January, 1982, came within the purview of the attorney-client privilege, even though he did not become Glenn’s defense counsel. See
Mailer
v.
Mailer,
The court in Woburn made an erroneous analogy to Commonwealth v. Mullen, supra, which held that, upon testifying, a criminal defendant waives the privilege against self-incrimination. Spalding, supra at 18.
Some of the cases on which the defendant relies involve testimony as to specific privileged conversations, rather than to events which were a topic of a privileged conversation. See,
e.g., In re Sealed Case,
The defendant also relies on
United States
v.
Bump,
Cf. Mass. Bar Ass’n Comm. on Professional Ethics, Opinion No. 84-3 (1984) (attorney-client privilege continues despite fact that the confidential information has become notorious). We do not reach the question whether the fact that Glenn had consulted Mr. Davis with regard to the charges against him or had had a confidential conversation relative to those matters with Mr. Davis is within the scope of the privilege. See
In re Grand Jury Investigation,
We emphasize that, absent a trial, neither we nor a trial judge can resolve the question whether the common law attorney-client privilege would have to yield to a constitutionally based claim of denial of the right of confrontation or of the right to a fair trial. See, e.g.,
Davis
v.
Alaska,
Although not adopted by this court, the ethical considerations appearing in the American Bar Association’s Code of Professional Responsibility and Canons of Judicial Ethics may be relied on in interpreting the Canons of Ethics and Disciplinary Rules.
Commonwealth
v.
Michel,
Such a conflict of interest may later give rise to a claim by a criminal defendant that he received ineffective assistance of counsel. See, e.g.,
Commonwealth
v.
Cobb,
See Developments in the Law, Conflicts of Interest in the Legal Profession, 94 Harv. L. Rev. 1244, 1376-1378 (1981); Mass. Bar Ass’n Comm. on Professional Ethics, Opinion Nos. 75-7 (1975), 76-12 (1976), 77-1 (1977); State Bar of Cal. Standing Comm. on Professional Responsibility & Conduct, Opinion No. 1980-52 (1980); Bar Ass’n of Greater Cleveland Professional Ethics Comm., Opinion No. 150 (1983); Vermont Bar Ass’n Comm. on Professional Responsibility, Opinion No. 83-6 (1983).
But see
United States
v.
Vargas-Martinez, supra
at 1104 (defendant’s choice of counsel may be subordinate to the proper administration of justice); Developments in the Law,
supra
at 1394 & n. 120 (arguing that a defendant’s right to an attorney with undivided loyalty does not give him the opposite of that right — the right to an attorney whose loyalities are divided — even if the choice is voluntarily and intelligently made, when the conflict substantially impairs the quality of representation). The language in
Davis, supra
at 787 n.12, appears contra: “If defendants may forgo their rights to be represented by counsel altogether, it would seem a fortiori that they may waive the right to have counsel free from conflicts of interest.”
Connor,
however, qualifies
Davis
by stating that “[t]he right, however, is not absolute, and may, in some circumstances, be subordinate to the proper administration of justice. ... A judge therefore must have some discretion to disqualify a conflict-burdened attorney when the conflict might well restrict or prevent counsel’s fulfilment of his role. . . . Such power is ‘to be exercised sparingly and when the need is apparent and pressing and only after careful consideration, but with the power goes the duty to exercise it on proper occasions.’
Collins
v.
Godfrey,
Included in these ramifications is the possibility that, if Mr. Davis becomes a witness at trial, he will at least suffer diminished credibility both as a witness and as defense counsel, or, indeed be required to withdraw as defense counsel. See S.J.C. Rule 3:07, Canon 5, DR 5-102. See also S.J.C. Rule 3:08, DF 6, as appearing in
In some circumstances it is sensible for the judge “to ensure that a defendant has had the advice of independent counsel before finding the defendant’s waiver valid” (emphasis supplied). Connor, supra at 505 n.5. See also Developments in the Law, supra at 1313.
