The Tunney Act is a 1974 federal law that requires every civil antitrust settlement between the Justice Department and a private defendant to go through public disclosure, a 60-day comment period, and independent approval by a federal judge before it takes effect. Codified at 15 U.S.C. § 16, the statute exists to keep the executive branch from quietly resolving competition cases on terms that leave the underlying harm in place. A judge, not just a prosecutor, has to conclude the deal serves the public interest.
Which Cases the Act Covers
The Act reaches civil cases the United States files under the Sherman Act or the Clayton Act.1GovInfo. Public Law 93-528 – Antitrust Procedures and Penalties Act When the DOJ Antitrust Division sues over price-fixing, market allocation, or an anticompetitive merger and the parties settle before trial, the proposed consent decree must run the Tunney Act gauntlet before a court can enter it.
Several things fall outside the statute. Cases brought by the Federal Trade Commission follow their own procedures. Criminal antitrust prosecutions, which carry their own sentencing and fine structure, are not covered either.2Office of the Law Revision Counsel. 15 USC 1 – Trusts, etc., in Restraint of Trade Illegal; Penalty The Act targets a narrow gap: civil settlements where the government’s claims have never been tested by a judge or jury.
What DOJ and the Defendant Must File
Before a court evaluates any proposed decree, the DOJ has to file a competitive impact statement along with the settlement. The statute lists six required elements, including the nature of the case, the practices alleged, the expected effect of the remedy on competition, and, importantly, a description of the alternative remedies the government actually considered.3Office of the Law Revision Counsel. 15 USC 16 – Judgments That last item forces the government to put on the record why it picked this particular fix over others, which gives the court and commenters something concrete to test.
Each defendant has its own disclosure obligation. Within 10 days of the filing, the company must describe every communication its officers, directors, employees, or agents had with any federal officer or employee about the proposed settlement. The one carve-out covers communications between the defendant’s attorney of record and DOJ lawyers acting alone. Before the court can enter the decree, the defendant must certify under oath that the disclosure is true and complete.3Office of the Law Revision Counsel. 15 USC 16 – Judgments The purpose is to surface any political interference in the terms. The statute does not attach a separate penalty for an incomplete disclosure, but the sworn certification means a false filing carries the usual consequences of misleading a court.
All of these materials get published in the Federal Register and made available at the district court hearing the case.
The 60-Day Public Comment Period
Publication in the Federal Register starts a mandatory 60-day comment window. During that same window, the DOJ has to publish a summary of the settlement and the competitive impact statement in newspapers of general circulation covering the district where the case sits, the District of Columbia, and any other district the court names.3Office of the Law Revision Counsel. 15 USC 16 – Judgments
Anyone can send written comments to the Antitrust Division. Competitors, trade associations, and consumer groups regularly do. The DOJ then has to review every comment, prepare a written response, and file both the comments and the responses with the court, which are also published in the Federal Register.4Federal Register. United States v. ASSA ABLOY AB, et al. – Response of the United States to Public Comments on the Proposed Final Judgment Nothing gets entered as a final judgment until this cycle is complete.
Can Outsiders Formally Intervene?
Filing a comment is easy. Becoming a party is not. There is no statutory right to intervene in a Tunney Act proceeding. A third party has to satisfy Federal Rule of Civil Procedure 24 and show that its participation would actually help the court make its public interest determination. Courts have consistently held that simply disliking the government’s chosen remedy is not enough; a would-be intervenor generally needs to show the government is not faithfully representing the public interest, such as through evidence of bad faith.5U.S. Department of Justice, Antitrust Division. Memorandum of the United States in Opposition to Motion to Intervene For most outsiders, commenting is the realistic route.
The Judge’s Public Interest Review
After comments close and the DOJ files its responses, a federal judge has to decide whether the proposed settlement serves the public interest. Under 15 U.S.C. § 16(e), the court must evaluate the competitive impact of the decree, including whether it effectively ends the alleged violations, whether the enforcement provisions are adequate, and whether the terms are ambiguous. The judge also has to weigh the effect on competition in the relevant market, the impact on the public, and the potential benefit of taking the case to trial.6Office of the Law Revision Counsel. 15 USC 16 – Judgments – Section: Public Interest Determination
The word “shall” in that provision is the product of a fight Congress had with the courts. Before 2004, the statute said the court “may” consider those factors, and some judges read that as permission to rubber-stamp. In 1995, the D.C. Circuit held in United States v. Microsoft Corp. that a district judge could reject a consent decree only if it would make a “mockery of the judicial function,” otherwise deferring almost entirely to prosecutorial judgment. Congress disagreed. The 2004 amendments explicitly stated that reading the statute that narrowly misconstrued its purpose and swapped “may” for “shall” to make the review mandatory.6Office of the Law Revision Counsel. 15 USC 16 – Judgments – Section: Public Interest Determination
Even with real review, the judge cannot redesign the deal. The court cannot substitute its own preferred remedy or demand concessions the government never asked for. The review asks whether the settlement falls within the range of outcomes a reasonable prosecutor might accept given the alleged violations. If it does, and the terms are clear enough to enforce, the judge enters final judgment and the decree takes effect.
What Happens If the Court Says No
A judge who finds the proposed decree does not serve the public interest can only refuse to enter it. Rewriting the terms is not on the table. The DOJ and the defendant can go back and negotiate revised terms, but nothing forces them to. If they cannot agree, the DOJ can proceed to trial or, in some cases, withdraw the complaint.
Outright rejections are rare. The DOJ knows in advance that its filing faces public scrutiny and judicial review, so it has strong incentive to produce a settlement that can survive both. When courts do push back, the usual result is a revised deal with tougher terms rather than the case collapsing.
How Long Consent Decrees Last
Modern consent decrees almost always sunset automatically after a set period. The Antitrust Division adopted this practice in 1979, with roughly 10 years from entry as the typical term.7United States Department of Justice. Department of Justice Announces Initiative to Terminate Legacy Antitrust Judgments Older judgments were often entered with no expiration date, leaving decrees technically in force long after the markets they addressed had changed beyond recognition.
To clean up that backlog, the DOJ launched a Judgment Termination Initiative. The Division identifies legacy judgments that no longer serve their purpose, posts them for public comment, and then moves the appropriate court to terminate.8United States Department of Justice. Judgment Termination Initiative
A defendant that wants out of an active decree before it expires can petition the court under Rule 60(b) of the Federal Rules of Civil Procedure, arguing that changed circumstances make continued enforcement inequitable.9U.S. Department of Justice. United States Motion to Terminate Legacy Antitrust Judgment and Memorandum in Support Thereof It is a flexible standard, and the company carries the burden. When the DOJ and the defendant agree on a modification, the court reviews the proposed change under a standard similar to the original Tunney Act review, asking whether the revised terms still fall within the zone of settlements consistent with the public interest. Agreed modifications receive considerable deference.10United States Department of Justice. Response to Public Comments on the Proposed Modified Consent Decree Contested modifications face a more demanding four-part inquiry drawn from general consent decree law.
Enforcing a Decree Against a Company That Violates It
A consent decree entered under the Tunney Act is a court order, and violating it exposes the company to civil contempt. Courts have broad authority to enforce compliance, including ordering specific corrective actions and imposing conditions such as advance notice before launching new products or practices that could implicate the decree.11U.S. Department of Justice. Motion by the United States for Judgment of Civil Contempt and to Enforce Preliminary Injunction – U.S. v. Microsoft Corp.
Companies sometimes attempt workarounds that technically comply with the decree’s language while defeating its purpose. Courts have rejected that approach, holding that “paper compliance” or strained readings that effectively nullify the order can support a contempt finding. A company cannot claim safety just because the specific scheme it used was not spelled out in the prohibition. The decree means what it was designed to accomplish, not only what its narrowest reading might allow.