This unusual case presents difficult questions regarding the appropriate role of federal courts when called upon by disqualification motions to evaluate the conduct of attorneys who appear before them. Three male Health and Physical Education teachers (HPETs) in the New York City school system appeal from an order of the United States District Court for the Southern District of New York, Morris E. Lasker, J., disqualifying their counsel upon the motion of three female HPETs. Appellant male teachers claim that the order was an abuse of discretion because it disregarded their constitutional rights, and was without any sound basis. For reasons set forth below, we hold that the motion to disqualify should have been denied, and we therefore reverse the order of the district court.
I
The contending parties on appeal — the male and female HPETs — are all defendants in this declaratory judgment action brought by the Board of Education of the City of New York and the Chancellor of the City School District. In February 1977, these plaintiffs found themselves in the middle of apparently contradictory positions held by the Commissioner of Education of the State of New York1 and the office of Civil Rights of the Department of Health, Education and Welfare (HEW). In a case involving one of these appellants, the State Commissioner had ruled that the use of separate seniority lists for male and female HPETs for the purpose of layoffs was illegal.2 Shortly thereafter, HEW initially indicated to the Board that HEW took exactly the contrary view, that merger of the lists would violate Title IX of the Education Amendments of 1972, 20 U.S.C. §§ 1681 et seq. Caught in this apparent dilemma, plaintiffs provisionally merged the seniority lists of male and female HPETs and commenced this action for a declaratory judgment in which all concerned parties would be present. The complaint named as defendants HEW and its Secretary,3 the New York State Commissioner of Education, the State Division of Human Rights, three named male HPETs, individually and as representatives of all male HPETs, and three named female HPETs, individually and as representatives of all female HPETs. The male and female defendants have asserted counterclaims and cross-claims. The relief sought by plaintiffs is a judgment declaring that the provisional policy of merging the seniority lists, effective February 1, 1977 but not retroactively, is lawful.
The two classes of defendants are the actual contending parties in this litigation. The male HPETs allege that maintaining separate seniority lists for male and female HPETs is illegal and that:
all defendant male Health and Physical Education teachers who were laid off on or after September 1,1975, are entitled to reinstatement with back pay and all other retroactive benefits incident to their positions to the date of their layoff if less senior female teachers were retained at that time or at any time thereafter.
The female HPETs allege that their seniority status perpetuates past discriminatory practices of plaintiffs and that if the provisional merged seniority list is used for layoff purposes “it will result in the layoff of at least six times as many female HPETs as male HPETs.” The stakes in the lawsuit are obviously high.
The male HPETs are represented .in this action by James R. Sandner, Esq., who is also General Counsel of New York State United Teachers (NYSUT). That organization is an unincorporated membership association of approximately 180,000 teachers, librarians, guidance counsellors and other *1244school related employees of the almost 800 school districts in New York State.4 We are told that in each of the school districts there is a separate local union, which is the exclusive bargaining representative for employees in that unit. The majority of these individual unions have chosen to affiliate themselves with NYSUT, but the latter does not collectively bargain for any public employees. It does, however, provide a number of services to its members, including a legal service program under the direction and control of Mr. Sandner. Both the male and female HPETs are represented in collective bargaining by the American Federation of Teachers (AFT), to whom they pay dues. A portion of the dues paid to the AFT is remitted to NYSUT, which, at least in part, apparently finances the legal service program.
Under the program, NYSUT’s members may apply to obtain legal representation free of charge. Mr. Sandner and his staff may take an applicant’s case when, in their judgment, the claim is both job-related and meritorious. It is through this procedure that the male defendants retained Mr. Sandner as their attorney. „ NYSUT itself, however, has taken no position on the merits or on any other issue in this litigation.
The female HPETs moved to disqualify Mr. Sandner as counsel for the male HPETs or, in the alternative, to require NYSUT to furnish counsel for the female teachers. Judge Lasker concluded that “the female teachers are paying, in part, for their opponents’ legal expenses.” This violated “at least the spirit, if not the letter, of Canon 9 of the Code of Professional Responsibility that ‘A lawyer should avoid even the appearance of impropriety.’ ” Accordingly, the judge granted the motion and this appeal by the male HPETs followed.
II
Appellants’ briefs discuss at length various Supreme Court cases dealing with the rights of associational free speech, group-sponsored legal action and First Amendment considerations, e. g., United Transportation Union v. Michigan, 401 U.S. 576, 91 S.Ct. 1076, 28 L.Ed.2d 339 (1971); United Mine Workers v. Illinois State Bar Ass’n, 389 U.S. 217, 88 S.Ct. 353, 19 L.Ed.2d 426 (1967); Brotherhood of Railroad Trainmen v. Virginia ex rel. Virginia State Bar, 377 U.S. 1, 84 S.Ct. 1113, 12 L.Ed.2d 89 (1964); NAACP v. Button, 371 U.S. 415, 83 S.Ct. 328, 9 L.Ed.2d 405 (1963). These issues are not substantially implicated on this appeal.
Button established as part of the First Amendment freedoms of association and political expression the right of a group to litigate controversial points of view in court free of governmental action purporting to regulate the practice of law. Here, however, NYSUT has made no effort to appear in the litigation either as a party or as an amicus. And indeed, appellants repeatedly insist that NYSUT has taken no position on any issue in this litigation. Since there has been no activity by the group, the Button principle is not applicable here.
Transportation Union, Mine Workers and Trainmen hold that a state may not, in the guise of regulating the practice of law, consistent with the First Amendment prevent efforts of a union to provide its members practical and economical access to courts to press work-related personal injury claims. Those cases establish the right to engage in “collective activity undertaken to obtain meaningful access to the courts,” Transportation Union, supra, 401 U.S. at 585, 91 S.Ct. at 1082, where the members of the group are at least substantially united in interest. None of the claims asserted with the aid of those legal plans would, if successful, have disadvantaged any union member. In contrast, this case presents a seniority dispute where the real adversaries are union members. It is thus difficult to characterize Mr. Sandner’s representation of the men as “collective activity” of the group within the meaning of those cases.5 *1245It is true that also underlying those cases “was the Court’s concern that the aggrieved receive information regarding their legal rights and the means of effectuating them.” See Bates v. State Bar of Arizona, 433 U.S. 350, 376 n. 32, 97 S.Ct. 2691, 53 L.Ed.2d 810 (1977). But here there is no claim that the male defendants were unaware of their legal rights.
Also not controlling, though not necessarily irrelevant, are the fair representation cases, e. g., Humphrey v. Moore, 375 U.S. 335, 84 S.Ct. 363, 11 L.Ed.2d 370 (1964); Ford Motor Co. v. Huffman, 345 U.S. 330, 73 S.Ct. 681, 97 L.Ed. 1048 (1953), discussed by appellants. Those eases hold that, in the context of a union’s duty fairly to represent the bargaining unit, a union may, if in good faith, assert a position that benefits some of its members to the detriment of others. Since NYSUT has taken no position on the merits, it is far from clear that the union’s right to take a position, established by those cases, is implicated here.
Appellants suggest that the recent Supreme Court decision in In re Primus, 436 U.S. 412, 98 S.Ct. 1893, 56 L.Ed.2d 417 (1978) supports the view that an individual attorney like Mr. Sandner has a First Amendment right to make his views known in the courts even though his conduct in that direction might otherwise breach ethical canons. In Primus, a lawyer, who was also an officer of the Columbia, South Carolina branch of the American Civil Liberties Union (ACLU), orally suggested the possibility of a lawsuit to a woman who had been sterilized as a condition of continued state medical assistance. This was followed by a letter offering the ACLU’s free legal assistance. The Supreme Court described appellant’s actions as “undertaken to express personal political beliefs and to advance the civil-liberties objectives of the ACLU.” 436 U.S. at 422, 98 S.Ct. at 1900. The Court held that attorney Primus’s activities so characterized could not be punished as “solicitation” without violating First Amendment freedoms. While the language just quoted refers to the attorney’s “personal political beliefs,” the main emphasis in the Court’s opinion was that the activities under question were “on behalf of the ACLU,” id. at 432, 98 S.Ct. 1893, and were protected under the freedom of association cases already referred to.
We doubt that the principle of Primus extends to control this case. The freedom of association cases are distinguishable for the reasons already given. To the extent that Primus protects simply a lawyer’s First Amendment rights, the attorney there was encouraging the airing in court of a point of view she believed in, that otherwise probably would not have been asserted by the potential plaintiff with whom she communicated. By contrast, Mr. Sandner’s activity here was not really of that informative character. The male HPETs he represents are defendants and would have litigated their point of view (and Mr. Sandner’s) regardless of his input. Indeed, it should be noted that the male HPETs sought out Mr. Sandner, not the other way around. Primus does not suggest that an attorney has a First Amendment right to conduct any particular representation, in the face of ethical proscriptions to the contrary, in the absence of any showing that such representation is necessary to facilitate assertion of a specific point of view in court.
Thus, while the male defendants have a right to obtain legal advice and representation, we do not believe that on these facts the First Amendment protects the right of a particular attorney to represent them in court. We thus conclude that the First Amendment does not constrain consideration of the propriety of Mr. Sandner’s representation and the disqualification order, to which we now turn.
Ill
We begin the discussion by noting that, curiously, the power of the federal courts to *1246disqualify attorneys in litigation pending before them has long been assumed without discussion, see, e. g., General Contract Purchase Corp. v. Armour, 125 F.2d 147, 149 (5th Cir. 1942); United States v. Bishop, 90 F.2d 65, 66 (6th Cir. 1937); Brown v. Miller, 52 App.D.C. 330, 286 F. 994, 997 (1923); T. C. & Theatre Corp. v. Warner Bros. Pictures, 113 F.Supp. 265, 271 n. 15 (S.D.N.Y.1953), and attention has focused on identifying the circumstances in which exercise of the power is appropriate. Our reading of the cases in this circuit suggests that we have utilized the power of trial judges to disqualify counsel where necessary to preserve the integrity of the adversary process in actions before them. In other words, with rare exceptions disqualification has been ordered only in essentially two kinds of cases: (1) where an attorney’s conflict of interests in violation of Canons 5 and 9 of the Code of Professional Responsibility 6 undermines the court’s confidence in the vigor of the attorney’s representation of his client, see, e. g., Fund of Funds, Ltd. v. Arthur Andersen & Co., 567 F.2d 225 (2d Cir. 1977); Cinema 5, Ltd. v. Cinerama, Inc., 528 F.2d 1384 (2d Cir. 1976), or more commonly (2) where the attorney is at least potentially in a position to use privileged information concerning the other side through prior representation, for example, in violation of Canons 4 and 9,7 thus giving his present client an unfair advantage, see, e. g., Fund of Funds, Ltd. v. Arthur Andersen & Co., supra; Emle Industries, Inc. v. Patentex, Inc., 478 F.2d 562 (2d Cir. 1973). In such cases, we note Chief Judge Kaufman’s oft-quoted admonition that,
When dealing with ethical principles, we cannot paint with broad strokes. The lines are fine and must be so marked. Guideposts can be established when virgin ground is being explored, and the conclusion in a particular case can be reached only after a painstaking analysis of the facts and precise application of precedent.
Fund of Funds, Ltd., supra, 567 F.2d at 227, quoting United States v. Standard Oil Co., 136 F.Supp. 345, 367 (S.D.N.Y.1955). But in other kinds of cases, we have shown considerable reluctance to disqualify attorneys despite misgivings about the attorney’s conduct. See, e. g., W. T. Grant Co. v. Haines, 531 F.2d 671 (2d Cir. 1976); Ceramco, Inc. v. Lee Pharmaceuticals, 510 F.2d 268 (2d Cir. 1975). This reluctance probably derives from the fact that disqualification has an immediate adverse effect on the client by separating him from counsel of his choice, and that disqualification motions are often interposed for tactical reasons. See Allegaert v. Perot, 565 F.2d 246, 251 (2d Cir. 1977); J. P. Foley & Co., Inc. v. Vanderbilt, 523 F.2d 1357, 1360 (2d Cir. 1975) (Gurfein, J., concurring). And even when made in the best of faith, such motions inevitably cause delay. For example, this lawsuit has been at a standstill now for close to a year.
Weighing the needs of efficient judicial administration against the potential advantage of immediate preventive measures, we believe that unless an attorney’s conduct tends to “taint the underlying trial,” see W. T. Grant Co., supra, 531 F.2d at 678, by disturbing the balance of the presentations in one of the two ways indicated above, courts should be quite hesitant to disqualify an attorney. Given the availability of both federal and state comprehensive disciplinary machinery, see, e. g., Local Rules of the United States Court of Appeals for the Second Circuit § 46(h) (1978), there is usually no need to deal with all other kinds of ethical violations in the very litigation in which they surface. See Lefrak v. Arabian Am. Oil Co., 527 F.2d 1136, 1141 (2d Cir. 1975); Ceramco, Inc. v. Lee Pharmaceuticals, supra, 510 F.2d at 271. Cf. United States v. Pastore, 537 F.2d 675 (2d Cir. 1976) .
*1247With these thoughts in mind, we turn to the ethical problems presented by the instant appeal.8 The district court disqualified Mr. Sandner because a “layman’s faith would be severely troubled” by the fact that “the female teachers are paying, in part, for their opponents’ legal expenses.” There is no claim, however, that Mr. Sandner feels any sense of loyalty to the women that would undermine his representation of the men. Nor is there evidence that his representation of the men is anything less than vigorous. There is also no claim that the men have gained an unfair advantage through any access to privileged information about the women. Were there any such problem, the women would not be asking, and the district judge would not have ordered, as an alternative to disqualification of Mr. Sandner, that NYSUT pay their attorney’s fees. Thus, in no real sense can Mr. Sandner’s representation of the men be said to taint the trial.
We agree that there is at least some possibility that Mr. Sandner’s representation of the men has the appearance of impropriety, because of the large number of union members involved and the public importance of the civil rights issue at the heart of the dispute. But in any event, we think that disqualification was inappropriate. We believe that when there is ■ no claim that the trial will be tainted, appearance of impropriety is simply too slender a reed on which to rest a disqualification order except in the rarest cases. This is particularly true where, as in this case, the appearance of impropriety is not very clear. We note that while on one hand there is an element of unfairness to the women,9 on the other it seems probable that if NYSUT were to take a position on the merits of this litigation, Mr. Sandner’s representation of the men would apparently be within the protection of the “fair representation” cases discussed in Part II, supra. This means that the question whether Mr. Sandner’s conduct is unethical could be a very close one. Since disqualification entails immediate disruption of the litigation, it is better to relegate any questions about Mr. Sandner’s conduct to other appropriate proceedings. In addition to the possibility of grievance proceedings and an internal union attack on the legal plan, see note 9, supra, it may be that judicial construction of the plan, in an appropriate lawsuit, could provide some relief for the women.
We therefore reverse the order of the district court disqualifying counsel, and remand for continuation of the action.
. At that time, the Commissioner was Ewald Nyquist.
. In the Matter of the Appeal of Daniel Gavrin, No. 9321 (Oct. 5, 1976).
. These defendants have since been dismissed from the case by Judge Lasker.
. Some NYSUT members are employees of private schools and universities.
. Nor is there here the need to provide representation to the men in order to redress an imbalance in legal resources. In the Supreme Court’s group legal plan cases, there was evidence that the plans’ purpose was to combat the overreaching by both employers and mem*1245bers of the bar that had in the past effectively thwarted recovery of adequate compensation for injuries. Since the contending parties here are all union members, the men’s resources are presumably comparable to their adversaries’.
. Cánon 5 provides:
A lawyer should exercise independent judgment on behalf of a client.
Canon 9 provides:
A lawyer should avoid even the appearance of professional impropriety.
. Canon 4 provides:
A lawyer should preserve the confidences and secrets of a client.
. There is no dispute that the order here is appealable, but we do take note of recent controversy centering on appealability of district court orders denying a disqualification motion. See Note, The Appealability of Orders Denying Motions for Disqualification of Counsel in the Federal Courts, 45 Chi.L.Rev. 450 (1978). Although Silver Chrysler Plymouth, Inc. v. Chrysler Motors Corp., 496 F.2d 800 (2d Cir. 1974) (en banc) recently established that such orders denying disqualification are appealable in this circuit, there have been later rumbles of discontent regarding the new rule. See Allegaert v. Perot, 565 F.2d 246, 251 (2d Cir. 1977); W. T. Grant Co. v. Haines, supra, 531 F.2d at 677-78; Van Graafeiland, Lawyer’s Conflict of Interest — A Judge’s View (Part II), N.Y.L.J., July 20, 1977, at 1, col. 2. Obviously where, as here, the motion seeking disqualification has been granted, appellate review is appropriate.
. The unfairness may in part be due to the nature of the plan adopted by NYSUT which leaves so much to Mr. Sandner’s discretion. This suggests that the women should take whatever steps are possible within normal internal union processes. Cf. also Abood v. Detroit Board of Education, 431 U.S. 209, 237-42, 97 S.Ct. 1782, 52 L.Ed.2d 261 (1977).