AMENDED PANEL OPINION
TORRUELLA, Circuit Judge.
This appeal presents a question of first impression which directly implicates the rule-making powers of the district courts, and indirectly, rights guaranteed by the Sixth Amendment of the Constitution.1 The precise point before us is whether a district court can adopt a local rule which requires prosecutors to seek prior judicial approval before serving a grand jury subpoena upon an attorney, for the purpose of obtaining evidence about the attorney’s clients.
Background
In early 1986 the Supreme Judicial Court of Massachusetts (SJC), at the prompting of the Massachusetts Bar Association, adopted an ethical rule known as Prosecu-torial Function 15 (“PF 15”),2 which states that:
It is unprofessional conduct for a prosecutor to subpoena an attorney to a grand jury without prior judicial approval in circumstances where the prosecutor seeks to compel the attorney/witness to provide evidence concerning a person who is represented by the attorney/witness.
Thereafter, on June 27, 1986, the United States District Court for Massachusetts specifically amended its Local Rules to include PF 15 as a rule of the District Court, effective July 1, 1986.3
The response of the federal prosecutorial establishment to PF 15 was the filing of the law suit which gives rise to this appeal.4 The United States and various of its prosecutors who are members of the Massachusetts bar,5 claim the invalidity of PF 15 both as a rule of the SJC and as a local rule of the District Court. The substance of the allegations are that PF 15 violates the Supremacy Clause of the Constitution because it allegedly conflicts with the Federal Rules of Criminal Procedure and federal substantive law, and because the local rule which adopted PF 15 exceeds the District Court’s rule-making powers.
After a hearing the District Court on February 28, 1986 denied plaintiffs’ re[651]*651quest for an injunction, holding that PF 15 was within the judiciary’s supervisory power over grand juries, was not violative of the Supremacy Clause, and did not imper-missibly interfere with federal prosecutorial responsibilities.
On appeal plaintiffs-appellants claim: (1) that the District Court lacked the power to promulgate PF 15 as a local rule, (2) that the Supremacy Clause bars enforcement of PF 15 against federal prosecutors, and (3) that PF 15 is so wanting in sound policy value that this Court should exercise its supervisory powers to invalidate it.
The Supremacy Clause issue
In our view, appellants’ arguments regarding the Supremacy Clause are either moot or fail to present a justiciable controversy at this time]
It is axiomatic that the Supremacy Clause of the Constitution6 has relevance only to state interference with federal law. See Hillsborough County v. Automated Medical Laboratories, Inc., 471 U.S. 707, 105 S.Ct. 2371, 2375, 85 L.Ed.2d 714 (1985); Michigan Canners & Freezers Assn. v. Agricultural Marketing & Bargaining Board, 467 U.S. 461, 104 S.Ct. 2518, 2523, 81 L.Ed.2d 399 (1984). Yet, since its adoption by the District Court, PF 15 can no longer be considered to be a state law, because by its incorporation into the local rules, PF 15 has become federal law. See United States v. Hvass, 355 U.S. 570, 574-75, 78 S.Ct. 501, 504, 2 L.Ed.2d 496 (1958). It is immaterial that its origin lies with a rule of the SJC. By its absorption into the local rules, first indirectly in the original version of Local Rule 5(d)(4)(B), and later by specifically including SJC Rule 3:08 (which contains PF 15) within the text of Local Rule 5(d)(4)(B)), PF 15 is as much federal law as if enacted initially by the district court. To that extent, the Supremacy Clause argument is clearly spurious.
Nonetheless appellants press this claim against the possibility that a federal prosecutor, a member of the Massachusetts bar, may be theoretically vulnerable to being charged in the state disciplinary forum if he/she acts contrary to PF 15 in a jurisdiction other than Massachusetts, (for example, if plaintiff Dabrowski, a member of the Massachusetts bar, serves a subpoena in Connecticut, where he is an assistant United States attorney, without compliance with PF 15). If PF 15 is read literally, appellants’ fears, although somewhat farfetched, cannot be totally discounted. We are not free, however, to ignore the record in this case and the policy statements of those charged with administering PF 15. See Field v. Brown, 610 F.2d 981, 991 (D.C.Cir.), cert. denied, 446 U.S. 939, 100 S.Ct. 2160, 64 L.Ed.2d 792 (1979).
As interpreted by defendant-appellee Klubock, Bar Counsel of the Massachusetts Board of Bar Overseers and the person charged with instituting all disciplinary proceedings in Massachusetts, PF 15 will not be applied against any federal prosecutor for any action taken extraterritorially. Furthermore, Klubock has stated that any enforcement proceedings dealing with alleged violation of ethical rules, including PF 15, would, as applied to federal prosecutors, be brought only in the District Court of Massachusetts. Thus, as presently interpreted and enforced by the Massachusetts authorities, federal prosecutors who are members of the Massachusetts bar are subject to PF 15 only for their actions within the District of Massachusetts, and, in such cases, through disciplinary action brought only in the federal forum. That forum also has before it the policy statements of the Massachusetts authorities, upon which we are relying for this decision. While such policy continues in effect, there is no case or controversy for us to decide, and hence there is no remaining Supremacy Clause issue. See Field v. Brown, supra. We, of course, cannot pre-[652]*652diet any changes in the stated policy, or what would be the outcome of any legal situation created thereby — we should not cross that proverbial bridge until required to do so by the constitutional circumstances.
The Rule-Making Power of the District Courts
It is generally accepted that the district courts have broad rule-making powers both by reason of the inherent nature of the judicial process, ex-statute, see Link v. Wabash Railroad Co., 370 U.S. 626, 82 S.Ct. 1386, 8 L.Ed.2d 734 (1962); United States v. Hudson, 11 U.S. (7 Cranch) 32, 34, 3 L.Ed. 259 (1812); Eash v. Riggins Trucking Inc., 757 F.2d 557, 561 (3d Cir.1985) (en banc), and pursuant to powers statutorily vested in the courts. See 28 U.S.C. § 2071;7 Fed.R.Crim.P. 57;8 Fed.R.Civ.P. 83;9 Michaelson v. United States, 266 U.S. 42, 66, 45 S.Ct. 18, 20, 69 L.Ed. 162 (1924); Ex parte Robinson, 86 U.S. (19 Wall.) 505, 510, 22 L.Ed. 205 (1873); Anderson v. Dunn, 19 U.S. (6 Wheat.) 204, 227, 5 L.Ed. 242 (1821); Eash v. Riggins Trucking Inc., supra; Ma v. Community Bank, 686 F.2d 459, 471 (7th Cir.), cert. denied, 459 U.S. 962, 103 S.Ct. 287, 74 L.Ed.2d 273, reh’g denied, 459 U.S. 1081, 103 S.Ct. 504, 74 L.Ed.2d 642 (1982). See generally Roberts, The Myth of Uniformity in Federal Civil Procedure: Federal Civil Rule 83 and District Local Rule-making Powers, 8 Univ. Puget Sound L.Rev. 537 (1985); Flanders, In Praise of Local Rules, 62 Judicature 28 (June — July, 1978); Weinstein, Reform of Federal Court Rulemaking Procedures, 76 Col.L.Rev. 905 (1976); Note, Rule 83 and the Local Rules, 67 Col.L. Rev. 1251 (1967); Comment, The Local Rules of Civil Procedure in the Federal District Courts — A Survey, 1966 Duke L.J. 1011.
We need not, for purposes of this appeal, fully describe the nature or extent of this rule-making power. Initially it is sufficient if we make reference to the various cases holding that this power is generally limited to (1) procedural rather than substantive matters, see Colgrove v. Battin, 413 U.S. 149, 93 S.Ct. 2448, 37 L.Ed.2d 522 (1973) (local rule that established six-person juries for civil cases is a permissible procedural innovation), (2) which are not inconsistent with the Federal Rules, see Hawes v. Club Ecuestre El Comandante, 535 F.2d 140, 143 (1st Cir.1976) (local rule requiring non-domiciliary plaintiffs to post security for costs, expenses and attorneys’ fees is valid and not contrary to Federal Rules), or (3) with Federal statutes. See Johnson v. Manhattan Ry., 289 U.S. 479, 503, 53 S.Ct. 721, 730, 77 L.Ed. 1331 (1933) (local rule regarding work assigned to district judge invalid as inconsistent with specific statutory provision regarding designated circuit judge).
Whether it is characterized as ethical or procedural, or whether the power in ques[653]*653tion derives as a result of statutory delegation 10 or inherent judicial authority,11 the competence of the district courts to make local rules regarding the admission of attorneys to their respective bars, and the control of their conduct thereafter, cannot at this late date be seriously questioned. See Roadway Express v. Piper, 447 U.S. 752, 766, 100 S.Ct. 2455, 2464, 65 L.Ed.2d 488 (1980); Cohen v. Hurley, 366 U.S. 117, 123-24, 81 S.Ct. 954, 958, 6 L.Ed.2d 156 (1961); Ex parte Garland, 71 U.S. (4 Wall) 333, 18 L.Ed. 366 (1867); Ex parte Secombe, 60 U.S. (19 How.) 9, 15 L.Ed. 565 (1856); Ex parte Burr, 22 U.S. (9 Wheat.) 529, 6 L.Ed. 152 (1824); Eash, supra, 757 F.2d at 561; Kevlik v. Goldstein, 724 F.2d 844, 847 (1st Cir.1984); Brown v. Supreme Court of Virginia, 359 F.Supp. 549 (E.D.Va.1973), aff'd, 414 U.S. 1034, 94 S.Ct. 534, 38 L.Ed.2d 327 (1973). Naturally, this power may not be exercised arbitrarily. In re Fisher, 179 F.2d 361, 370 (7th Cir.1950), cert. denied, 340 U.S. 825, 71 S.Ct. 59, 95 L.Ed. 606 (1950); see Koningsberg v. State Bar, 353 U.S. 252, 77 S.Ct. 722, 1 L.Ed.2d 810 (1957). PF 15 is clearly a local rule which seeks to control discipline within its bar membership and, thus, within the general rule-making power of district courts.
That there are latent ethical issues in the serving of a subpoena on actual or prospective counsel opponent should be perceived without much difficulty. Even where an indictment may not have issued, and thus technically the attorney/witness is not yet an “adversary,” since the subpoena regulated by PF 15 seeks to compel evidence “concerning a person who is represented by the attomey/witness,” it relates to an established attorney-client relationship. The serving of a subpoena under such circumstances will immediately drive a chilling wedge between the attomey/witness and his client. This wedge is the natural consequence of several underlying factors created by this anomalous situation. Most obvious is the fact that the client is uncertain at best, and suspicious at worst, that his legitimate trust in his attorney may be subject to betrayal.12 And because the subpoenaed attomey/witness may himself feel intimidated, this may in fact take place if there is not even minimal ethical control regulating the subpoenaing of an attorney/witness to seek evidence against his client.
More subtle, but perhaps more important in terms of the ethical setting within which PF 15 is framed, is the immediate conflict of interests created between the attorney/witness and his client by the serving of a subpoena in the context of what is contemplated by PF 15. As a witness, the attorney/witness has separate legal and practical interests apart from those of his client. These interests may or may not coincide with those of the attomey/witness and his client. The mere possibility of such a conflict is sufficient to create a problem. A minimal overview by an impartial observer, as is provided by PF 15, can go far in preventing the creation of these ethical conflicts between the attomey/witness and his client.
Closely related to this last point is the diversion of interests and resources brought about by the conversion of the attorney into a witness. The attorney now has a difficult “second front” to deal with, in which he must dedicate his own time and resources to looking after his own interests, while at the same time trying to protect those of his client. The strain on the attorney’s time/resources, to say nothing of the disruption in his/her client’s representation, goes far beyond a mere conflict of interest situation. Although it is impos[654]*654sible to quantify accurately,13 it is logical to presume that the unrestricted use of PF 15 subpoenas14 will result in the reduction of the effectiveness, in criminal cases, of those counsel who ethically survive such a procedure, and will tend to discourage attorneys from providing representation in controversial criminal cases.
Again along this vein, by the service of a PF 15 subpoena on the attorney, the attorney is converted into a possible witness in a case against his client. Because the Canons of Ethics, see ABA Model Code of Professional Responsibility, Disciplinary Rule 5-102(A) and (B) (1982),15 prohibit an attorney from being a witness in a case in which he is also an attorney, counsel will possibly be required to resign as attorney for his client. Not only the right to counsel of choice under the Sixth Amendment but also due process is thus implicated, because the attomey/prosecutor is potentially given control over who shall be his attorney/adversary. For those who may look upon this discussion as one of purely theoretical value, we suggest a reading of our recently decided United States v. Diozzi, 807 F.2d 10 (1st Cir.1986). It is clear that courts should get an ethical handle on this situation at the earliest possible moment.
Last, but not necessarily least, is the potential for abuse that underlies the natural tendencies promoted by adversarial postures. Again with reference to recent circuit litigation, the possibility for improper use of attorney subpoenas in a PF 15 context are not far-fetched. See In re Grand Jury Matters, 593 F.Supp. 103, (D.N.H.), aff'd, 751 F.2d 13 (1st Cir.1984) (subpoenas to uncover fee arrangements between attorneys and their clients pending trial in state court and under investigation in the district court properly quashed); see also In re Grand Jury subpoena, 615 F.Supp. 958 (D.Mass.1985) (subpoenas to uncover legal files relating to alleged sham marriages quashed). We cannot overlook the fact that the relationships which are subject to regulation and control by the courts are tripartite in nature. They concern not only the dealings of counsel and the courts and of counsel and their clients, but equally important, that of counsel versus counsel in their adversarial roles. It goes without saying that this last relationship includes that of the counsel/prosecutor versus the counsel/defense attorney. Any situation or condition which implicates any of these professional relationships in any of their multi-faceted possibilities and situations, is potentially subject to reasonable regulation and control by the courts. PF 15 is such a reasonable regulation created by the dynamics of changing circumstances.
Our dissenting colleague feels that PF 15 is invalid because it relates to a national problem which should be dealt with by Congress or the Supreme Court “acting at the national level ... [because] [a] district court may not effect such a fundamental change through local rules.” This point of view, however, stems from a misconception of the issue before us. The fundamental underlying problem attacked by PF 15 is an ethical one brought about by the concerns we have just enumerated. The ethical rela[655]*655tionships between courts, attorneys and their clients, although obviously of interest to Congress and the Supreme Court, have been left traditionally to the primary regulation of the courts before whom those problem arise. The regulation by district courts of the ethical conduct of those who practice before it can hardly be called “a fundamental change.”
There are two additional reasons why we believe the dissent to be incorrect. First, the fact that a problem is national in scope does not necessarily remove the need for local solutions. In the event that national decision makers ultimately seek to resolve the problem, the experience gained through local efforts can only make for more informed federal rulemaking. Meanwhile, in the absence of a uniform federal rule, following the well known maxim that nature abhors a vacuum, a local solution to the local version of the problem is the best that can be done.
Second, although PF 15 does have procedural as well as ethical consequences, those consequences are no more “fundamental,” than the changes effected by the district court in Colgrove v. Battin, 413 U.S. 149, 93 S.Ct. 2448, 37 L.Ed.2d 522 (1973), in which the Supreme Court approved a local rule establishing six-person juries in civil cases. The Court held that the local rule was “not a ‘basic procedural innovation’ ” proscribed to local rulemaking, because it did not “bear on the ultimate outcome of the litigation.” Id. at 163-64 n. 23, 93 S.Ct. at 2456 n. 23. Be that as it may, it is difficult to imagine changes more “fundamental” in nature, or concerning issues in which national or constitutional interests are more implicated than a local rule changing the numerical composition of federal juries. If such local rulemaking was approved by the Court in Colgrove, we fail to see any reason why the ethical and procedural consequences of PF 15 should render it invalid.
Nevertheless, we must be concerned with the limitations on judicial rule-making, especially the requirement that any local rule not conflict with the Federal Rules or Federal statute. Appellants argue specifically that PF 15 conflicts with Rule 17 of the Federal Rules of Criminal Procedure.
Rule 17 of the Federal Rules of Criminal Procedure
One of appellants’ primary attacks on PF 15 is their contention that “requiring prior judicial approval of grand jury subpoenas is inconsistent” with Rule 17 of the Fed.R. of Crim.P. Appellant’s Brief at p. 18. To the extent that this argument is directed at the concept that PF 15 requires judicial approval prior to the issuance of a grand jury subpoena, id. at pp. 18-23, such a view can only result from an erroneous reading of PF 15. Nothing in PF 15 in any way inhibits a prosecutor from seeking the issuance of a subpoena by the clerk of the court pursuant to Fed.R.Crim.P. Rule 17(a).16 Since PF 15 does not relate to the issuance of the subpoena, there is no conflict between the clerk’s ministerial authority to issue subpoenas under Fed.R.Crim.P. 17(a), and the duties imposed on the prosecutor under the provisions PF 15 regarding the service of subpoena.
Clearly, the perceived problem which the language of PF 15 (“to subpoena an attorney”) seeks to control is the service of subpoenas on attorneys by prosecutors. As has been previously discussed, ante at 653-55, it is this action, the serving of an attorney with a grand jury subpoena, which triggers the various concerns that have given rise to the enactment of PF 15, i.e., the “chilling” of the attorney-client relationship, the implication of Sixth Amendment concerns, the creation of conflicting interests between an attorney and [656]*656his/her client, and the possibility for adversarial abuse.
Proceeding to the crux of appellants’ challenge, there is nothing in the express language of Rule 17 which specifically prohibits the ethical controls imposed upon prosecutors, qua members of the bar, which PF 15 establishes. In fact only Rule 17(d) and (e) are directly concerned with the serving of subpoenas, but this concern, as related to paragraph (d), deals with the persons that are authorized to serve subpoenas and the manner in which service is to be effectuated, while as to paragraph (e), the rule is limited to matters concerning the place of service.17 No particular language in Rule 17 refers to the issue at hand.
Appellants argue, however, that the failure of Rule 17 to require any intervening judicial approval prior to the serving of subpoena manifests an intention against the establishment of such a procedure. Appellants further contend that the failure to provide for prior judicial approval as is required by PF 15, does not substantially affect the rights of the attorney/witness or his/her client, because the subpoena can always be challenged by a motion to quash, after service has been effectuated.
Interestingly enough, as can be readily seen from a reading of Rule 17, there is no specific provision in that rule for a motion to quash a subpoena ad testificandum. The only related provision is contained in paragraph (c) thereof, which grants the right to challenge a subpoena duces tecum by filing a motion to quash or modify.18 Were we to accept appellants’ arguments regarding the consequences of omission of express authority to act under this Rule, we would have to conclude that motions to quash or modify subpoenas ad testifican-dum are unavailable to witnesses or parties. Yet, that is the very remedy which appellants urge upon us in this appeal as providing adequate relief to subpoenaed attorney/witnesses, and one, which, as we all know, is routinely litigated in the various district courts. The very fact that there exists a remedy entitled “motion to quash or modify subpoena ad testificandum,” sans Rule 17, indicates that silence in the Federal rules of procedure does not necessarily mean that the courts are powerless to correct perceived problems as they arise, either by decision, or by local rule, where appropriate.
In sum we know of no prohibition, express or implied, in Rule 17, or for that matter in any Federal statutory provision referred to by appellants, which inhibits PF 15 as a local rule of the District Court. Our supervisory power
Ironically, although appellants deny the supervisory power of the District Court to enact PF 15, see Appellants’ Brief at 14-33, they press upon us the exercise of our supervisory authority to proscribe that Court’s regulation of the members of its bar. Id. at 40-47. Particularly since that control is specifically vested by statute within the authority of each individual [657]*657court, see 28 U.S.C. § 1654, such supervisory authority, if it exists, exists only to correct abuses of discretion. See In re Berkan, 648 F.2d 1386 (1st Cir.1981). See Beale, Reconsidering Supervisory Power in Criminal Cases: Constitutional and Statutory Limits on the Authority of the Federal Courts, 84 Col.L.Rev. 1433 (1984). In our view PF 15, rather than constituting an abuse of discretion, is a limited, reasonable response to what appears to be a mounting professional problem. See citations at footnote 13, ante. We believe that district courts are in a better position to judge, in the first instance and absent abuse of discretion, what is the appropriate response to this problem.
Lest there be any misinterpretation about this Court’s position regarding the issue before us, it goes without saying, that attorneys, just like all other persons, United States v. Nixon, 418 U.S. 683, 94 S.Ct. 3090, 41 L.Ed.2d 1039 (1974), are not above the law and are subject to its full application under appropriate circumstances. See United States v. Twomey, 806 F.2d 1136 (1st Cir.1986); United States v. Carbone, 798 F.2d 21 (1st Cir.1986); United States v. Nieves-Pacheco, 658 F.2d 14 (1st Cir.1981), cert. denied, 457 U.S. 1117, 102 S.Ct. 2927, 73 L.Ed.2d 1328 (1982). Attorneys are not, by virtue of such status, exempt from answering to subpoenas when properly served, including even when compliance has not been made with provisions such as PF 15. The consequence of non-compliance with PF 15 is to be resolved in different proceedings. Such noncompliance does not excuse disobedience to lawful process.
Back on track, we find nothing in PF 15 to justify the triggering of the use of our supervisory powers. As indicated, PF 15 is closely worded in nature, and is a limited answer to an ethical problem. On its face, it is clear that it does not inhibit judicially un approved attorney subpoenas where the attorney/witness is not served “to provide evidence concerning a person who is represented by the attorney/witness.”
Secondly, the interference, if any, with the prosecutorial function, is highly unobtrusive. As contemplated, the judicial approval is sought in an ex parte manner by the prosecutor. Considering the requirements contained in the United States Attorney’s internal guidelines19 for seeking attorney/witness subpoenas under PF 15 circumstances, it would appear that all relevant information is already readily available to the prosecutor for ex parte presentation to the district court.
Lastly, there is no question that the problem which has given rise to PF 15 is a mounting one. Judging alone from the considerable legal literature which has emerged on this subject, see, ante, footnote 13, to say nothing of the cases, ante at 654, the subpoenaing of attorney/witnesses under PF 15 circumstances appears to present ethical concerns of a wide-spread nature. American Bar Association, Grand Jury Policy and Model Act (1977-1982), Grand Jury Principles, No. 29; American Bar Association, Reports with Recommendation to the House of Delegates, Report No. HID (February, 1986); Report of the Committee on Criminal Advocacy of the Association of the Bar of the City of New York, The Issuance of Subpoenas Upon Lawyers in Criminal Cases by State and Federal Prosecutors: A Call for Immediate Remedial Action, July 17, 1985. Furthermore, when we consider the admission [658]*658by appellants to the effect that in the District of Massachusetts alone, from 50 to 100 attorney subpoenas per year have been served during the last four years under PF 15 circumstances, and we compare this figure to the criminal case load in that District of approximately 306 to 463 cases filed per year,20 the possibility21 arises that PF 15 situations could very well be present in from 10.7 to 32.6% of that District’s criminal cases, not an insignificant proportion.
Our dissenting colleague expresses concern as to the possible effect that PF 15 might have on the grand jury’s “mission” as an independent investigatory body. Again, this argument is misdirected. PF 15 is not aimed at grand jury action. It deals solely with prosecutorial conduct in the prosecutor’s capacity as a member of the bar. If, in fact, a grand jury acting independently of any prosecutorial influence issues a subpoena against an attorney/witness, the attorney/witness must honor it, or move to quash the subpoena in an appropriate manner. Such independent action by a grand jury has no relevance to PF 15 because none of the ethical concerns previously mentioned are implicated.22
Far from concluding that the adoption of the local rule that incorporated PF 15 was an abuse of the district court’s discretion and of the supervisory powers that it has over the members of its bar, we consider PF 15 to be a sound use of that authority. See In re Pantojas, 628 F.2d 701 (1st Cir.1980).
Conclusion
The law and its many facets is not an empty bottle. Rather, it is one, which like good’ wine, is nurtured in the vintage of experience. Recent experience has required more aggressive prosecution of society’s fight against the mounting evils of crime. We commend both vigorous prosecution and all legitimate means in aid of this laudable task. This, however, does not mean that society can afford a “no holds barred” approach to law enforcement lest the “solution” engender faults of an equally serious nature.
For the reasons herein indicated, the opinion of the district court is affirmed.