Opinion for the Court filed by Circuit Judge STARR.
Concurring opinion filed by Circuit Judge RUTH BADER GINSBURG.
STARR, Circuit Judge:
These petitions for review challenge an order by the Securities and Exchange Commission imposing sanctions on a registered broker-dealer and its president and principal shareholder. The petitioners advance a number of contentions, both constitutional and nonconstitutional in nature. For the reasons that follow, we vacate the Commission’s order and remand the case for further proceedings.
[1101]*1101I
This litigation pits the SEC against Blinder, Robinson & Co. (and its principal), a leading broker-dealer in the genre of securities known as “penny stocks.” The action arose out of an investigation into the actions of Blinder, Robinson and its president, Meyer Blinder, in underwriting an initial public offering of securities of American Leisure Corporation between December 1979 and March 1980. The purpose of the offering was to provide start-up funds for American Leisure’s proposed casino project in Atlantic City. In the course of the offering, Blinder, Robinson took a variety of steps destined to be challenged by the SEC. In particular, the Commission assailed Blinder, Robinson’s undisclosed purchase for its own account of almost 1 million units of the 12-million unit offering; 1 a host of other violations were alleged as well, including violations of the antifraud provisions of both the Securities Act of 1933 and the Securities Exchange Act of 1934.
Based on these allegations, the Commission brought a civil enforcement action pursuant to its statutory authority under section 20(b) of the 1933 Act, 15 U.S.C. § 77t(b) (1982), and section 21(d) of the 1934 Act, 15 U.S.C. § 78u(d), against both Blinder, Robinson and Meyer Blinder in the United States District Court for the District of Colorado. After a full trial, the district court entered findings of fact and conclusions of law, which are reported at 542 F.Supp. 468 (D.Colo.1982). The comprehensiveness of the district court’s thorough and careful opinion renders it unnecessary for us to recanvass the underlying facts. It suffices for present purposes to observe that the district court in Colorado found that (1) both Blinder, Robinson and Meyer Blinder had violated the antifraud provisions of the securities laws, 15 U.S.C. 77q(a), 78j(b), 78o(c) and various rules promulgated thereunder, including Rule 10b — 5; (2) the defendants had failed to establish a claimed defense of good-faith reliance on counsel and that, to the contrary, the firm had refused to follow the advice of counsel; and (3) comprehensive injunctive relief was appropriate, as articulated in nine specific subparagraphs set forth in 542 F.Supp. at 481-82.
Blinder, Robinson and Meyer Blinder took an appeal to the Tenth Circuit, which in due course affirmed entirely the district court’s judgment. SEC v. Blinder, Robinson & Co., et al. [1983-1984 Transfer Binder] Fed.Sec.L.Rep. (CCH) ¶ 99,491 (10th Cir.1983). The Supreme Court thereafter denied certiorari. 469 U.S. 1108, 105 S.Ct. 783, 83 L.Ed.2d 777 (1985).
As the foregoing litigation was proceeding through the appellate process, the SEC instituted an administrative proceeding against Blinder, Robinson and its president pursuant to section 15(b)(4) of the 1934 Act, 15 U.S.C. 78o(b)(4). That provision authorizes the Commission to impose sanctions on broker-dealers if, after notice and hearing, it determines that sanctions are in “the public interest.” The stated purpose of the proceeding was to determine what sanctions, if any, to impose on petitioners by virtue of their conduct during the American Leisure underwriting.2 See Order for Public Proceedings and Notice of Hearing (June 27, 1984), reprinted in Joint Appendix (J.A.) at 30.
In due course, a hearing ensued before an Administrative Law Judge. At the outset, the ALJ determined that petitioners could not, under principles of issue and [1102]*1102claim preclusion, introduce evidence as to any matters addressed in the district court’s opinion. Blinder, Robinson describes its fruitless efforts in this respect as follows:
First, petitioners sought to elicit testimony from Meyer Blinder concerning his reliance on counsel. Second, petitioners sought to introduce oral testimony from one of the principal attorneys concerning the advice to Meyer Blinder. When these requests were denied, petitioners sought to introduce into the record all evidence concerning reliance on counsel that had been before the District Court in the injunctive proceeding. This request, too, was denied.
Brief for Petitioner Blinder, Robinson & Co. at 7-8 (footnotes omitted.)
Largely rejecting petitioners’ claims that the firm had undertaken “substantial rehabilitative efforts to ensure that the American Leisure events would not be repeated,” id. at 9, the AU concluded that sanctions should be imposed. Specifically, the AU ordered that Blinder, Robinson’s registration be suspended for 45 days and that a two-year ban be imposed on Blinder, Robinson’s underwriting activities; as to Meyer Blinder, the AU concluded that he should be suspended from association with any broker or dealer for a period of 90 days. The AU put it this way:
In light of the egregiousness of the anti-fraud and antimanipulation violations found in the American Leisure injunction opinion ... coupled with the failures of Respondents to establish in the main their claims to fullsome rehabilatative [sic] actions and to a new and genuine dedication to compliance_ it is con-
cluded that substantial sanctions ... are ... in the public interest, but that sanctions of the severity recommended by the [Enforcement] Division are not required in light of the mitigative factors found herein, including the remedial steps actually taken....
Initial Decision (Aug. 30, 1985), J.A. at 517-L.
Neither petitioners nor the SEC staff were enamored of the AU’s decision. Both sides therefore appealed to the full Commission. In the order from which review is now sought, the SEC upheld the AU’s decision and choice of sanctions as to Blinder, Robinson, but increased the sanctions imposed on Meyer Blinder individually, determining that he should be barred permanently from association with any broker or dealer (with the proviso that he could apply for reinstatement after two years). See Opinion of the Commission (Dec. 19, 1984), J.A. at 536. In a detailed opinion, the SEC made the following points, among others: (1) petitioners’ claims of rehabilitation and reformation were unpersuasive, as evidenced by “wholly misleading” sales presentations and techniques still employed by the firm, J.A. at 547-48; (2) the firm’s much vaunted personnel changes since the American Leisure imbroglio were entitled to “little weight,” in view of key employees having been beguiled away from Blinder, Robinson by the enticing bid of a competing firm, as well as the tell-tale continuing presence of three high-ranking officers with disciplinary records, and, most importantly, of the firm’s continued dominance by Meyer Blinder himself, id. at 549; and (3) the sanctions imposed by the Commission, while stringent, were necessary to guard against “any repetition of the blatant misconduct in which respondents engaged.” Id. at 550.
The Commission expressly recognized the gravity of its decision:
We recognize the serious effect of the sanctions we are imposing. But we are convinced that lesser sanctions will not suffice. Our action is designed to protect the public interest not only by restricting respondents’ future activity in the securities business but also by deterring them from any repetition of their violative practices. The sanctions are a clear message to registrant, and to Blinder if and when he returns to the securities business, that any recurrence of misconduct will be dealt with severely. At the same time, the sanctions serve the important purpose of general deterrence, and should operate as a warning to any other participant in the securities indus[1103]*1103try who might be tempted to engage in similar misconduct.
Id. at 550 (citation omitted.)3
On New Year’s Eve 1986, the Commission entered a stay with respect to the sanctions imposed on Blinder, Robinson. J.A. at 553-56. Applying the criteria articulated by this court, see, e.g., Wisconsin Gas Co. v. FERC, 758 F.2d 669, 673-74 (D.C.Cir.1985); Washington Metro. Area Transit Comm’n v. Holiday Tours, Inc., 559 F.2d 841, 844 (D.C.Cir.1977), the Commission denied Meyer Blinder’s request for stay. On March 26, 1987, this court, over the opposition of the SEC, entered an order staying the entry of sanctions against Meyer Blinder. See Brief for Petitioner Blinder, Robinson & Co. at 10 n. 28.
II
Petitioners assert a variety of grounds for overturning the SEC’s order. For ease of discussion, their contentions can be divided into two categories, those arising under the Constitution, and other, nonconsti-tutional, claims.
A
1. Separation of Powers
In their broadest line of attack, petitioners contend that the SEC lacked power under the Constitution to seek in federal district court the injunction that provided the foundation for the set of administrative sanctions that the Commission ultimately fashioned. In petitioners’ view, an independent agency whose members are secure from removal at the President’s will is constitutionally disabled from bringing law enforcement actions, a function entrusted to the Executive under Article II of the Constitution. We decline to entertain this aspect of petitioners’ challenge, however, by virtue of the fact that petitioners have previously litigated (and lost) this very issue in the federal district court in Colorado, the appeal of which is currently pending in the Tenth Circuit.
The well-established policies underlying preclusion of relitigation are especially applicable here. The waste of judicial resources would be particularly stark were we to allow petitioners to have another day in court on this question. Two separate Courts of Appeals are being asked to resolve the very same issue, presented by the very same parties, on a single set of facts. We therefore defer to our colleagues in the Tenth Circuit, inasmuch as the issue was first presented, and has been initially resolved, in that circuit. See Durfee v. Duke, 375 U.S. 106, 84 S.Ct. 242, 11 L.Ed.2d 186 (1963) (when first court’s jurisdiction is actually litigated, a subsequent court must give the first court’s resolution preclusive effect); Stoll v. Gottlieb, 305 U.S. 165, 59 S.Ct. 134, 83 L.Ed. 104 (1938) (same).4
Petitioners suggest that relit-igation is appropriate where, as here, the prior court’s jurisdiction is at issue. Under those circumstances, petitioners argue, the court’s resolution of the issue is open to collateral challenge, citing Kalb v. Feuerstein, 308 U.S. 433, 60 S.Ct. 343, 84 L.Ed. 370 (1940), and United States v. U.S. Fidelity Co., 309 U.S. 506, 60 S.Ct. 653, 84 L.Ed. 894 (1940), in support of their position. We [1104]*1104disagree. Properly read, both Kalb and US. Fidelity stand narrowly for the propositions that collateral attack is permitted only when the first court’s proceeding "substantially infringe[d] the authority of another tribunal or agency of government,” Restatement (Second) of Judgments § 12(2) (1982), or when it improperly trenched on sovereign immunity.5 The present case is, in our view, unexceptional; having fully litigated (and lost) in Colorado, petitioners, have no persuasive claim to a second try.6
For the foregoing reasons, we conclude that precedent supports, and sound policies informing the orderly administration of justice demand, our not entertaining petitioners’ constitutional challenge to the SEC’s civil enforcement power.
2. Due Process
In addition to petitioners’ jointly advanced separation-of-powers argument, Meyer Blinder argues, separately, that the procedures employed by the SEC and its staff in this dispute run afoul of the Fifth Amendment’s Due Process Clause. As Mr. Blinder sees it, the SEC’s repairing first to federal court, vigorously litigating against him in that forum, and thereafter imposing Commission-spawned administrative sanctions on him cannot stand in the face of the bedrock constitutional requirement of procedural fairness. Here is the way Mr. Blinder summarizes his claim:
Having prevailed on its contested lawsuit, the SEC now is seeking to exercise quasi-judicial discretion to decide how severely Mr. Blinder should be sanctioned for the conduct that was the subject of the lawsuit. If the Commission’s proposed course is permitted, a plaintiff will have become a judge of its own claim.
Brief for Petitioner Meyer Blinder at 13.
Invoking a line of cases illustrated by the Supreme Court’s decision in In re Murchison, 349 U.S. 133, 75 S.Ct. 623, 99 L.Ed. 942 (1955), which we shall discuss presently, Mr. Blinder maintains that the Constitution “does not permit ... a transformation of litigation roles” so as to permit a litigant to become a judge in its own case. Brief for Petitioner Meyer Blinder at 13. The infirmity in the SEC’s procedures in this instance, Blinder complains, is exacerbated by three additional factors: first, the SEC chose in the first instance to eschew administrative procedures and to resort initially to federal district court, a forum which granted substantial relief to the Commission and which remains available for any agency request for further relief; second, the prejudice wreaked by the SEC’s “doffing its litigator’s hat” and “donning judicial robes” is especially “acute when the agency, as litigant, has considered and rejected a settlement offer,” id. at 14; and third, the likelihood of injustice (and its appearance) is “aggravated when the agency continues to engage in active litigation with the party whom it is judging.” Id.
We disagree with Mr. Blinder’s analysis. In our view, his approach represents, upon reflection, not merely a narrow attack on the specific procedures employed in his case. Rather, Mr. Blinder’s challenge, fairly viewed, represents nothing less than an assault on the constitutionality of a principal feature of the Administrative Procedure Act itself. That familiar statute, enacted by Congress over forty years ago, represents a comprehensive charter for the conduct and operation of modem administrative agencies. Among other things, the APA prohibits agency staff from combining prosecutorial and adjudicative functions in the same case. 5 U.S.C. § 554(d) (1982). But it expressly exempts agency members from this prohibition of combined functions. Id.
[1105]*1105The permissibility of the APA-sanctioned regime under the Constitution has been strongly suggested (if indeed not settled) by the Supreme Court in the case of Withrow v. Larkin, 421 U.S. 35, 95 S.Ct. 1456, 43 L.Ed.2d 712 (1975). There, in recognizing the substantiality of arguments challenging the combination of functions or purposes in a single individual or body, the Court observed that “legislators and [commentators] have given much attention to whether and to what extent distinctive administrative functions should be performed by the same persons. No single answer has been reached. Indeed, the growth, variety, and complexity of the administrative process have made any one solution highly unlikely.” Id. at 51, 95 S.Ct. at 1466. With this recognition of the problem, the Court, speaking through Justice White, went on to state:
Congress has addressed the issue in several different ways, providing for varying degrees of separation from complete separation of functions to virtually none at all. For the generality of agencies, Congress has been content with section 5 of the [APA], which provides that no employee [may combine functions], but which also expressly exempts from this prohibition “the agency or a member or members of the body comprising the agency. ”
Id. at 51-52, 95 S.Ct. at 1467 (citations and footnotes omitted) (emphasis added).
In its discussion of applicable precedent, the Withrow Court carefully distinguished Mr. Blinder’s featured case, In re Murchison. At issue in Murchison was the constitutionality of a Michigan law authorizing a judge of any court of record in the State to act as a one-man grand jury. Faced with this unusual statute, the Supreme Court found a due process violation in Murchison’s conviction before a judge who tried him for contempt arising out of his, Murchison’s, testimony before the same judge acting as a one-man grand jury. The basic teaching of Murchison was this:
A fair trial in a fair tribunal is a basic requirement of due process. Fairness of course requires an absence of actual bias in the trial of cases. But our system of law has always endeavored to prevent even the probability of unfairness. To this end no man can be a judge in his own case and no man is permitted to try cases where he has an interest in the outcome.
349 U.S. at 136, 75 S.Ct. at 625.
Interpreting this broad statement, the Court in Withrow expressly distinguished the situation of administrative agencies from the prototypical situation of a judge performing combined functions. “Murchison has not been understood,” the With-row Court stated, “to stand for the broad rule that the members of an administrative agency may not investigate the facts, institute proceedings, and then make the necessary adjudications.” 421 U.S. at 53, 95 S.Ct. at 1467. Indeed, Justice White continued, “[t]he [Murchison ] Court did not purport to question ... the Administrative Procedure Act.” Id.
Withrow’s qualification of Murchison’s broad teaching is further illustrated by the Court’s treatment of one factual twist in Withrow itself. The facts of Withrow, briefly stated, were these: one Dr. Larkin had obtained a license to practice medicine in Wisconsin from a state-created Examining Board, composed of practicing physicians. In due course, the Examining Board sent Dr. Larkin a notice that it would hold an investigative hearing, as authorized under state law, to determine whether he had engaged in certain proscribed acts. In the notice, the Board indicated that, based on the evidence to be presented at the investigative hearing, the Board would then decide what action to take, including possibly referring the matter for criminal prosecution or instituting license revocation proceedings.
Dr. Larkin promptly filed an action in federal district court challenging the Board’s procedures as violative of the Due Process Clause under the Murchison line of authority. In the course of that litigation, the Board was enjoined by the trial court from going forward with its proposed hearing. Faced with that order, the Board went forward, albeit without a hearing, and [1106]*1106issued formal findings of fact and conclusions of law that probable cause existed to believe Dr. Larkin had violated state law. The findings were then forwarded to the state prosecutor for possible prosecution.
In addressing this aspect of the Board’s course of action, the Withrow Court flatly-rejected the contention that this particular tack showed bias or prejudice on the part of the Board. The Court once again invoked the administrative agency model in language that bears directly on the question Mr. Blinder brings before us:
It is also very typical for the members of administrative agencies to receive the results of investigations, to approve the filing of charges or formal complaints instituting enforcement proceedings, and then to participate in the ensuing hearings. This mode of procedure does not violate the Administrative Procedure Act, and it does not violate due process of law.
Id. at 56, 95 S.Ct. at 1469 (footnote omitted) (emphasis added).
Withrow v. Larkin thus stands as a formidable (if not insurmountable) barrier to Mr. Blinder’s due process attack. Undaunted, Mr. Blinder seeks to avoid Withrow’s pronouncements by suggesting its inapplicability where, as here, the agency chooses first to litigate in federal court, rather than instituting administrative proceedings. We are at a loss to discern a meaningful distinction in the suggested difference. Whether the adversarial proceeding is before an agency-designated AU or a federal district court judge, the relationship obviously remains one of adversariness between agency and opponent. Indeed, if anything the difference cuts against Mr. Blinder’s position, because he was afforded the not insubstantial advantage of the neutral forum provided by an Article III court, with its attendant procedures and protections (including the rules of evidence and procedure) that may not obtain in an agency adjudication.7
Nor does the fact that the Commission considered and rejected Mr. Blinder’s offer of settlement alter our analysis. Offers of settlement are in the very nature of the litigation process; common experience tells us that neither consideration nor rejection of an offer of settlement contains within it the inherent likelihood of bias and prejudice. Settlement offers are rejected day in and day out for a multitude of reasons; but rejection of a settlement offer does not suggest prejudgment, much less bias, on the part of an administrative agency. If in Withrow v. Larkin the Examining Board’s issuance of formal findings of fact and conclusions of law did not suffice to establish bias, then the SEC’s rejection here of a settlement offer is even farther away from constitutionally forbidden territory.
Our conclusion in this respect is reinforced by (but by no means conditioned on) the fact that, as Mr. Blinder describes it, only one Commissioner who participated in the order imposing sanctions had participated in the earlier consideration and rejection of the settlement offer. It would be a strange rule indeed that inferred bias on such a tenuous basis, and then presumed that the bias spread contagion-like to infect Commissioners who were not even called upon to consider the settlement offer. To do so would manifest profound disrespect for Congress’ deliberately structuring agencies as (typically) multi-member bodies, with staggered terms and with requirements that the President appoint a certain number of members from the political party other than his own. To give credence to Mr. Blinder’s dark suspicion of bias notwithstanding this carefully crafted structure would flout what Justice White, in writing for the Court in Withrow, called “a [1107]*1107presumption of honesty and integrity” on the part of those who serve in office. Id. at 47, 95 S.Ct. at 1464.8
In short, we believe that Mr. Blinder has failed to heed Withrow’s message that a due process challenge directed broadly to combinations of purposes or functions in the modern administrative state “assumes too much.” Id. at 49, 95 S.Ct. at 1465. As in Withrow itself, acceptance of Mr. Blinder’s broad due process attack would transmogrify the sensible holding of Murchison,9 and in the process accede precisely to what the Supreme Court has twice warned against, namely a sweeping due process challenge that “ ‘would bring down too many procedures designed, and working well, for a governmental structure of great and growing complexity.’ ” Id. at 49-50, 95 S.Ct. at 1465-1466, quoting Richardson v. Perales, 402 U.S. 389, 410, 91 S.Ct. 1420, 1432, 28 L.Ed.2d 842 (1971).
Mr. Blinder argues, finally, that the district court in Colorado remains open for the SEC to seek any relief in addition to that which it previously sought and secured in that forum. This is, upon analysis, a policy argument, not one sounding in due process. This is particularly true in the circumstances of this case, where the SEC did not seek to obtain specific sanctions (save for injunc-tive relief) in district court against Mr. Blinder and his firm. The subsequent administrative proceeding therefore does not, fairly viewed, constitute a second bite at the apple for an agency that had failed to convince an Article III judge of the merits of a particular remedy. Instead, based upon the district court’s judgment, the SEC subsequently initiated procedures expressly ordained by Congress in section 15(b)(4). This, we are satisfied, does not run afoul of any values of fundamental fairness embodied in the Due Process Clause. Indeed, to accept petitioners’ broadside would do violence to the core value of flexibility (coupled with appropriate procedural protections) that has been the hallmark of the modern administrative process.
Indeed, a moment’s reflection suggests that acceptance of Mr. Blinder’s claim under the Due Process Clause would do considerable violence to Congress’ purposes in establishing a specialized agency to regulate in the difficult and challenging world of financial markets and securities regulation. Ironically, the wisdom of Congress’ handiwork is suggested by the brief of Mr. Blinder’s own firm, whose words, we believe, aptly capture the considerations informing Congress’ policy choice in this respect;
While courts are best equipped to adjudicate whether statutory violations occurred, Congress believed the SEC's particular expertise would best enable it to choose among available administrative disciplinary sanctions and to discern the interests of the investing public.
Blinder, Robinson Brief at 43 (footnote omitted).
In sum, to accept Mr. Blinder’s argument would be to work a revolution in administrative (not to mention constitutional) law, in the face of repeated cautionary signals from the Supreme Court. We decline the invitation to storm the barricades and, instead, content ourselves with following what seems to us the clear teaching of the Supreme Court that a fundamental aspect of the modern administrative state is not [1108]*1108founded upon a violation of the Due Process Clause.
3. Fourth Amendment
Blinder, Robinson devotes a few pages of its brief to the proposition that the SEC's disciplinary sanctions are infected with an underlying Fourth Amendment violation and thus cannot stand. As we understand the point, Blinder, Robinson maintains that the Formal Order of Investigation which led to the initial district court proceeding was unconstitutionally broad. This order, employed by the staff over 17 months after its issuance as the basis for investigating the American Leisure offering, “constituted a broad warrant supposedly authorizing the SEC staff to undertake an investigation, with administrative subpoena power, of a virtually unlimited range of conduct by Blinder, Robinson over an open-ended period of time.” Blinder, Robinson Brief at 35. Blinder, Robinson condemns the investigative order as a general grant of surveillance power over the entirety of the firm’s activities for an indefinite period of time. This, Blinder, Robinson complains, cannot be countenanced under the Fourth Amendment.
So framed, the argument appears to be an attack on the validity of the Colorado district court injunctive proceeding. And indeed, so it is. As such, it is doomed to fail, for even if the 1978 Formal Order could be viewed somehow as constituting an intrusion for purposes of Fourth Amendment analysis, a proposition which we need not address and with which the Commission emphatically disagrees, we will not entertain this untimely collateral attack on the Colorado proceedings. Those proceedings provided the time and the place for advancing any such claims of illegality; it is simply too late in the day to litigate issues that could have been adjudicated in the courts of the Tenth Circuit. Indeed, the record in this hydra-headed litigation reflects that the issue was in fact litigated by Blinder, Robinson in a separate action brought against the Commission and its staff, seeking injunctive and other relief on account of asserted Fourth Amendment violations. That action, the procedural history of which is described in one of the Tenth Circuit’s opinions in this litigation, Blinder, Robinson & Co., Inc. v. SEC, 748 F.2d 1415, 1417-18 (10th Cir.1984), indicates that twelve days before the SEC filed its complaint in federal district court in Denver, Blinder, Robinson and Mr. Blinder repaired to the same court in an attempted preemptive strike. That litigation ultimately ended with a whimper, namely an appellate determination of mootness, see id. at 1418-19. But in the process of resolving that branch of the litigation, the Tenth Circuit squarely rejected petitioners’ efforts to litigate the question of the legality of evidence secured pursuant to subpoenas issued under authority of the 1978 Formal Order. The Tenth Circuit put it this way:
At the trial [of the enforcement action] counsel for Blinder, Robinson did not object to the introduction of evidence obtained through the investigatory order.
Even assuming that Blinder, Robinson’s attorney’s failure to object to the allegedly improper evidence was due solely to the negligence of their counsel rather than to deliberative litigation strategy, this would not constitute a sufficient showing to warrant the extraordinary relief sought.
Id. at 1420.
Those words were penned by our colleagues in the Tenth Circuit almost four years ago. In view of the passage of time, the attack before us is even more tenuous. Stubbornly, Blinder, Robinson maintains (1) that the disciplinary order under challenge in this case is rooted in the decision of the district court in Colorado, and (2) that the latter decision is illegitimately grounded in Fourth Amendment violations. But the foundation of the argument obviously rests on sand, for the Tenth Circuit has, as we have seen, upheld the district court’s in-junctive order and ruled that Blinder, Robinson can no longer litigate the question of the legality vel non of the evidence (or the lawfulness of the 1978 Formal Order itself). We scarcely need remind counsel that this issue litigated fully in the Rockies cannot now be raised on the Eastern Sea[1109]*1109board, and indeed that it was utterly inappropriate even to suggest as much.
B
1. Issue Preclusion
In addition to the previously discussed constitutional claims, petitioners contend that the Commission erred in upholding the AU’s exclusion of evidence proffered by the broker-dealer with respect to the firm’s reliance (through Meyer Blinder) on counsel. Specifically, as we alluded to in the factual narrative above, Blinder, Robinson sought in the administrative proceeding to adduce the following evidence before the AU: (1) testimony of Meyer Blinder concerning the advice given to him by counsel; (2) testimony from one of the principal attorneys concerning the advice given to Mr. Blinder; and (3) when those requests were denied, the introduction of all evidence concerning reliance on counsel that had been before the district court in the Colorado injunctive proceeding.
The requests were denied by the AU on grounds of issue preclusion, inasmuch as the issue concerning good faith reliance on counsel had been litigated in the federal district court and resolved adversely to petitioners. The SEC agreed with the AU’s determination in this respect, stating that “[t]o allow the introduction of such evidence would permit the very relitigation that the doctrine of collateral estoppel is designed to prevent.” J.A. at 541.
The SEC is wrong. The issue before the district court in Colorado was manifestly not the question before the SEC in the administrative proceeding. As is readily apparent, the SEC litigated in federal court the question of petitioners’ liability vel non under the securities laws. Armed with the findings of fact (and the entry of broad injunctive relief) of the district court, the SEC then instituted an entirely different sort of proceeding, namely an administrative proceeding under section 15(b) of the 1934 Act. That proceeding was aimed at reaching a completely different determination than resolving the issue of liability, including the question of “good-faith reliance” on counsel. The precise question in the SEC proceeding was whether sanctions should be imposed “in the public interest.” Blinder, Robinson makes the argument well:
This “public interest” determination is separate from and in addition to the SEC’s determination as to the existence of the disqualifying conditions necessary for the imposition of any sanctions. As to sanctions, the extent to which petitioners sought the advice of counsel, the clarity of the advice, and petitioners’ reasons for following or disregarding it, in whole or in part, are highly relevant, even though the reliance on counsel may not have been sufficient to discharge petitioners from the underlying liability for statutory violations.
Blinder, Robinson Brief at 39-40 (footnote omitted) (emphasis added).
It is important in this respect to draw a clear distinction between the issue before the district court in Colorado — whether Meyer Blinder relied on counsel so as to establish a good-faith defense to liability— and the obviously related, but nonetheless analytically distinct, matter of the circumstances surrounding the lawyer-client relationship. We are in no way suggesting that Meyer Blinder (and, through him, Blinder, Robinson) is at liberty to relitigate the factual question as to whether there was reliance on counsel. That issue has been conclusively decided against him. As the district court expressly found, counsel advised Mr. Blinder to sticker the prospectus, and he chose to reject that advice.
But saying that, and nothing more, is not to state the whole of what is germane to the SEC in exercising its judgment as to the nature and scope of sanctions that are appropriate in the public interest. Unless the SEC is to adopt a sanctioning regime whereby specific offenses call for certain specific sanctions, it seems inescapable that evidence relevant to a party’s degree of culpability must be considered in deciding that issue. After all, that was the precise issue in the SEC’s section 15(b)(4) proceeding: how culpable was Mr. Blinder? In the district court, the issue was quite different. [1110]*1110The finding that Mr. Blinder did not rely on counsel’s advice does not tell us about the circumstances surrounding the advice given and Meyer Blinder’s rejection of it. Indeed, the district court’s opinion did not even address the question in great detail.
In the SEC’s administrative proceeding, however, questions of degree were singularly relevant. Mr. Blinder’s proffer of evidence in that proceeding was not, and could not have been, directed to litigating the issue of reliance on counsel as relevant to establishing a good-faith defense; rather, it related to the wholly different matter of the entirety of the relationship with counsel (including, for example, why the advice was rejected; which attorney’s advice was rejected; the precise nature of the various advice given, e.g., was it absolute and unequivocal, or somewhat flexible in nature, or something else).10 These latter points go to the question of possible mitigation, notwithstanding the definitively resolved issue of liability and the specific factual determination that Mr. Blinder did not rely on counsel’s advice.11
Indeed, the strength of petitioners’ core argument, that the nature of the administrative proceeding required the SEC to consider evidence relating to Mr. Blinder’s degree of culpability, is implicitly conceded by the Commission counsel. As the Commission indicates to us:
Blinder, Robinson is correct that the district court’s judgment is not preclu-sive as to the issue of what sanctions are required in the public interest.
SEC Brief at 28 n. 38 (citation omitted). Yet that is, in effect, precisely what the Commission held. It approved the ALJ’s refusal even to consider evidence concerning the relationship(s) with counsel on the theory that to dp so would permit relit-igation of issues adjudicated in Denver.
That error is not cured, as the SEC lamely suggests, by permitting petitioners to introduce evidence going to other points, such as “their asserted reformation and cessation of deceptive sales techniques.” Id. The logical fallacy of the SEC’s argument is apparent. Admitting evidence on issues a, b and c obviously does not cure a tribunal’s refusal to consider evidence on issue d, unless of course issue d is irrelevant to the question to be resolved. But in this instance that cannot be. The “public interest” standard is obviously very broad, requiring that the Commission consider the full range of factors bearing on the judgment about sanctions that the expert agency ultimately must render. In reaching that judgment, questions such as the precise nature and details of counsel’s advice, and indeed, the totality of the circumstances surrounding the lawyer-client relationships in question, are undoubtedly relevant. [1111]*1111Blinder, Robinson captures the point admirably:
Precluding petitioners in administrative disciplinary proceedings from presenting all evidence relevant to the issue of sanctions — whether or not previously presented to a District Court — would do violence to the considered allocations of adjudicatory responsibilities.... The statutory obligation placed on the SEC to exercise its judgment is not satisfied simply by having the SEC adopt the findings of the District Court.
Blinder, Robinson Brief at 43-44.
We agree. To uphold the SEC’s decision here would not only blink at its fundamental error in the treatment of petitioners’ attempt to introduce evidence relating to the relationship with counsel, but would also do violence to Congress’ intent that the SEC exercise its own judgment in these circumstances. In short, the SEC cannot turn a deaf ear to evidence that should, in reason, bear upon the judgment that the Commission is called upon to render.12
2. APA Challenge
Both petitioners devote considerable energy to attacking the sanctions imposed by the SEC as arbitrarily severe. We have been provided with the following arguments in particular: (1) the SEC subjects over-the-counter firms to disproportionately unfavorable treatment in comparison to Big Board-member firms that similarly run afoul of statutory or regulatory rules and requirements; (2) the SEC, in violation of fundamental requirements of administrative law, failed sufficiently to justify the harsh sanctions visited on petitioners; and (3) the two-year suspension of the firm from all underwriting and private placement activities exceeds the maximum period of suspension authorized under section 15(b)(4) of the 1934 Act. Impressive deci-sional authority is summoned to buttress the first two points, including an opinion by the late Judge Friendly in Arthur Dipper Corp. v. SEC, 547 F.2d 171 (2d Cir.1976), cert. denied, 434 U.S. 1009, 98 S.Ct. 719, 54 L.Ed.2d 752 (1978), where the Second Circuit set forth a variety of factors to employ in evaluating sanctions imposed by the SEC, and an opinion by our colleagues in the Fifth Circuit in Steadman v. SEC, 603 F.2d 1126 (5th Cir.1979), aff'd 450 U.S. 91, 101 S.Ct. 999, 67 L.Ed.2d 69 (1981), where the court erected a daunting standard to justify permanent exclusion from the securities industry. (“[Pjermanent exclusion from the industry is ‘without justification in fact’ unless the Commission specifically articulates compelling reasons for such a sanction.” Id. at 1140 (footnote omitted)).
The SEC invokes, in response, similarly impressive authority supporting the unquestioned proposition that the crafting of an appropriate remedy is peculiarly within the province of an expert agency, and can appropriately be judicially disturbed only where the remedy is “unwarranted in law or ... without justification in fact_” SEC Brief at 11, quoting Butz v. Glover Livestock Comm’n Co., 411 U.S. 182, 185-86, 93 S.Ct. 1455, 1458, 36 L.Ed.2d 142 (1973). Commission counsel points to the detailed reasons articulated by the SEC in visiting such substantial sanctions on petitioners. The SEC summarizes its position this way:
Given the district court’s findings that petitioners engaged in an on-going series of deliberately fraudulent transactions that included a deceptive sales campaign, arranging non bona fide transactions to give the appearance that the [American Leisure] offering was sold out, misleading their own counsel and then ignoring counsel’s advice, violating the escrow agreement, failing to return investors’ money as required, and engaging in prohibited trading in the putative aftermar[1112]*1112ket, this conclusion [as to sanctions] should need no further explanation.
SEC Brief at 12.
In the course of recounting petitioners’ manifold sins, Commission counsel suggests that the factors on which the Lipper court relied are not present here. Among those are the following:
Unlike Mr. Lipper, petitioners [in this case] did not seek counsel’s advice as to the totality of the conduct held to violate the securities laws; and, on the only issue that they did seek advice, their purchase of [American Leisure] securities, they rejected the advice they received.
Id. at 14 (citation omitted). By their own words, then, Commission counsel have indicated the relevance of petitioners’ relationship with counsel. Petitioners have been weighed in the balance and found wanting, in part because of their disdain for (or failure to secure) counsel’s advice. That failure, as the Commission sees it, plainly related to the conclusion that the American Leisure offering was “permeated with deliberate fraud.” Id. at 12 (quoting J.A. at 546). But the obvious problem with the SEC’s conclusions relating to Mr. Blinder’s relationship with counsel is that they assume the Commission had before it the full record germane to determining whether factors such as those emphasized by the Lipper court were present. That assumption, for reasons already stated, is ill-founded by virtue of the refusal even to consider potentially relevant evidence.
In brief, we are persuaded that the fundamental principle of administrative law that an agency act in a non-arbitrary, non-capricious fashion is necessarily implicated by the SEC’s refusal to permit evidence with respect to a salient factor. That is, in meting out sanctions, the Commission cannot adequately weigh the factors that it concedes should be considered without having before it the full set of facts necessary for reasoned consideration.
Thus, our analysis in this section of the opinion is inevitably affected by the Commission’s error, discussed in the preceding section, in refusing to consider evidence relating to the relationship with counsel on grounds of issue preclusion. We will therefore not extend further the length of this opinion, which is obviously but another (albeit important) chapter in this long-lived litigation. Instead, we will put down our pen and remand the case to the Commission for further action consistent with this1 opinion. On remand, the SEC will, of course, be obliged to satisfy the strictures of the APA by articulating an adequate rationale for whatever decision it may reach.
In this regard, we would be less than candid if we did not flag for the Commission our concern that petitioners have mounted a non-frivolous claim that they have been singled out for disproportionately harsh treatment. Petitioners list a series of instances which, they contend, demonstrate that the SEC’s hand comes down more heavily on smaller, newer firms than it does on old-line, or at least more established, houses with the “right sort” of exchange memberships. The allegation is thus not simply that penalties have differed from case to case. As the colloquies at oral argument suggested, each case in securities regulation, as elsewhere, is different. Those inevitable differences and gradations in fact can best be discerned and articulated by the Commissioners whose job it is to come to just these sorts of judgments.
But it does not exceed our appropriate function to indicate that we have seen warning signs. What is alleged here are not mere disparities, see Butz v. Glover Livestock Comm’n Co., 411 U.S. 182, 187, 93 S.Ct. 1455, 1458, 36 L.Ed.2d 142 (1973), but rather an asserted systemic pattern of disparate treatment, resulting in predictably, disproportionately harsh sanctions being visited upon firms such as Blinder, Robinson. If the Commission believes that the alarms are false, then it should say so and explain why what might appear to be troubling systemic variances are in fact not such variances at all, or, alternatively, variances justified by the circumstances of this [1113]*1113case.13 Finally, we emphasize in this respect that the Commission’s broad discretion in fashioning sanctions in the public interest cannot be strictly cabined according to some mechanical formula. Nothing that we say suggests in the slightest that the Commission does not enjoy wide latitude in fashioning appropriate sanctions; such latitude is inherent in the Commission’s broad grant of power from Congress, and is confirmed by such teachings as the Supreme Court’s decision in Butz. ******
A closing observation is in order: Nothing that we have said today should suggest any intent on our part to intrude into the domain of the previous litigation between these parties in the Tenth Circuit. Petitioners stand condemned for serious violations of the securities laws, and we have held today that it is entirely appropriate and lawful for the SEC to carry out its statutory responsibilities in crafting a suitable and appropriate sanction in response to those violations.
But the Commission must do more than say, in effect, petitioners are bad and must be punished. Petitioners do not stand alone; they are, alas, only two in a long line of enterprises and individuals who have seen fit to conduct themselves in violation of the law of the land. It is because of the SEC’s experience in dealing with such unhappy matters that it has the sensitive function, ordained by Congress, of deciding petitioners’ fate. In this setting, the Commission is not simply rendering a policy judgment; nor is it simply regulating the securities markets; it is, rather, singling out and directly affecting the livelihood of one commercial enterprise and terminating (possibly forever) the professional career of the firm’s founder. Faced with a task of such gravity, the Commission must craft with care.14
Ill
For the foregoing reasons, the order of the Commission is vacated and the case is [1114]*1114remanded for further proceedings consistent with this opinion.
It is so ordered.