Citizens United v. Federal Election Commission is the 2010 Supreme Court decision that struck down federal limits on independent political spending by corporations and unions. By a 5-4 vote, the Court held that the First Amendment protects political speech regardless of whether the speaker is a person, a corporation, or a labor organization. Corporations and unions may now spend unlimited amounts from their general treasuries on political advertisements and other communications, as long as that spending is not coordinated with a candidate’s campaign.
How the Case Reached the Supreme Court
In 2008, the conservative nonprofit Citizens United finished a documentary called “Hillary: The Movie,” a film sharply critical of then-Senator Hillary Clinton during her run for the Democratic presidential nomination.1Federal Election Commission. Citizens United v. FEC The group wanted to distribute it through video-on-demand within 30 days of the 2008 primaries.2Justia. Citizens United v. FEC, 558 U.S. 310 (2010)
Federal law at the time barred corporations from using general treasury funds for broadcast communications that identified a federal candidate within 30 days of a primary or 60 days of a general election.3Federal Election Commission. Federal Court Upholds Campaign Finance Law – Citizens United Must Provide Donor Information for Film About Hillary Clinton A federal court concluded that the documentary was the functional equivalent of advocating Clinton’s defeat, and because Citizens United accepted some corporate donations, it did not qualify for the narrow exemption available to certain ideological nonprofits.4Federal Election Commission. Citizens United v. FEC – Verified Complaint for Declaratory and Injunctive Relief Citizens United challenged the restriction, and the Supreme Court eventually broadened the question to address whether corporations have a First Amendment right to spend on political speech at all.
What the Court Decided
The Court ruled that the government cannot suppress political speech based on the corporate or union identity of the speaker. Justice Anthony Kennedy wrote the majority opinion, joined by Chief Justice John Roberts and Justices Antonin Scalia, Clarence Thomas, and Samuel Alito.5Legal Information Institute. Citizens United v. Federal Election Commission – Syllabus
Political speech, the majority held, is essential to democratic self-government and does not lose protection because its source is a corporation. Kennedy wrote that the government had no adequate justification for restricting independent corporate spending, because independent expenditures do not give rise to corruption or its appearance in the way that direct exchanges of money for political favors would.1Federal Election Commission. Citizens United v. FEC The public, not the government, was to judge which political messages have value.
The ruling built on Buckley v. Valeo (1976), which had drawn a line between contributions to candidates, which could be limited to prevent corruption, and independent expenditures, which received stronger constitutional protection because spending money to communicate a political message is itself a form of speech.6Justia. Buckley v. Valeo, 424 U.S. 1 (1976) Citizens United extended that protection to corporate and union speakers.
The decision invalidated the ban on corporate and union independent expenditures then codified at 2 U.S.C. § 441b, since recodified as 52 U.S.C. § 30118.7Office of the Law Revision Counsel. 52 U.S. Code 30118 – Contributions or Expenditures by National Banks, Corporations, or Labor Organizations After the ruling, corporations and unions could spend directly from their general treasuries on political ads, films, and other communications at any point in an election cycle.
Precedents and Statutes the Ruling Overturned
Citizens United overturned two major precedents. The first was Austin v. Michigan Chamber of Commerce (1990), in which the Court had upheld a Michigan ban on corporate independent expenditures based on the state’s interest in preventing the “distorting effects” of corporate wealth.8Library of Congress. Austin v. Michigan Chamber of Commerce, 494 U.S. 652 (1990) The Citizens United majority rejected that rationale, holding that the government cannot restrict speech based on the fear that some speakers are too wealthy or influential.
The second was the portion of McConnell v. FEC (2003) that had upheld the Bipartisan Campaign Reform Act’s ban on corporate-funded electioneering communications.1Federal Election Commission. Citizens United v. FEC
The statutory casualty was the BCRA provision, part of the McCain-Feingold Act, that prohibited corporations and unions from funding broadcast advertisements mentioning a federal candidate within 30 days of a primary or 60 days of a general election.2Justia. Citizens United v. FEC, 558 U.S. 310 (2010) Before Citizens United, the only legal route for corporate political spending was through a separate political action committee funded by voluntary employee or member donations. That requirement was gone.
The Dissent
Justice John Paul Stevens wrote the dissent, joined by Justices Ruth Bader Ginsburg, Stephen Breyer, and Sonia Sotomayor.9Legal Information Institute. Citizens United v. Federal Election Commission – Dissent Stevens warned that the ruling “threatens to undermine the integrity of elected institutions across the Nation.”
Corporations, the dissent argued, are legal creations designed for economic activity, not political participation. They cannot vote, they have no consciences, and they may be controlled by foreign interests. Stevens contended that the majority treated corporate spending as equivalent to individual speech while ignoring the structural advantages that let large organizations overwhelm the voices of ordinary voters. The sheer scale of corporate spending, in his view, creates an appearance of corruption that erodes public trust even without provable bribery.
Stevens also faulted the majority for reaching far beyond what the case required. The Court could have resolved the dispute narrowly, by deciding whether this particular documentary qualified for an exemption, without a broad constitutional declaration that overturned decades of precedent.
What the Ruling Did Not Change
Citizens United is sometimes described as removing all limits on political money. It did not. Several major restrictions survived, and the boundaries of the decision matter as much as its holding.
Direct Contributions to Candidates
The ruling applied only to independent expenditures, meaning money spent without coordinating with a candidate. The ban on direct corporate contributions to candidates and political parties was not disturbed.1Federal Election Commission. Citizens United v. FEC Individual contribution limits also stayed intact. For the 2025-2026 cycle, individuals and PACs still face per-candidate and per-committee caps set by the FEC.10Federal Election Commission. Contribution Limits
Disclosure and Disclaimer Rules
In a part of the decision that is often overlooked, the Court upheld BCRA’s disclosure and disclaimer provisions by an 8-1 margin. The majority wrote that disclaimers give voters information about who is speaking, and that disclosure is “the less-restrictive alternative to more comprehensive speech regulations.”5Legal Information Institute. Citizens United v. Federal Election Commission – Syllabus Organizations making independent expenditures must still report that spending to the FEC.11Federal Election Commission. Making Independent Expenditures
Spending by Foreign Nationals
Federal law still prohibits foreign nationals, including foreign governments, foreign corporations, and individuals who are not U.S. citizens or permanent residents, from making contributions, donations, or independent expenditures in connection with any federal, state, or local election. The prohibition extends to participating in decision-making about election-related spending by a U.S. entity.12Federal Election Commission. Foreign Nationals A U.S. subsidiary of a foreign corporation may set up a separate political fund only if the foreign parent does not finance the activity and foreign nationals do not control the spending decisions.
Super PACs and the SpeechNow Follow-On
Citizens United opened the door for corporations and unions to spend. A companion decision two months later, SpeechNow.org v. FEC (2010), applied the same reasoning to contribution limits. If independent expenditures cannot corrupt, the D.C. Circuit reasoned, then contributions to groups that make only independent expenditures cannot corrupt either. The court struck down the caps on how much an individual could give to such a group.13Federal Election Commission. Speechnow.org v. FEC
Together, the two rulings produced the Super PAC, formally the independent-expenditure-only political committee. The FEC recognized these committees through advisory opinions in mid-2010, allowing them to accept unlimited contributions from individuals, corporations, and unions for the sole purpose of making independent expenditures.10Federal Election Commission. Contribution Limits
The critical restriction is coordination. A Super PAC can raise and spend without limit, but it cannot coordinate its spending with a candidate or a candidate’s campaign. An independent expenditure, by definition, is made without consultation, cooperation, or shared decision-making with the candidate it supports or opposes.11Federal Election Commission. Making Independent Expenditures Critics argue the line between independent and coordinated has grown blurry in practice, with Super PACs sometimes run by close associates of the candidates they back.
Dark Money and 501(c)(4)s
A related consequence involves nonprofit organizations classified under section 501(c)(4) of the tax code. These social welfare organizations may engage in political campaign activity as long as it is not their primary purpose.14Internal Revenue Service. Political Campaign and Lobbying Activities of IRC 501(c)(4), (c)(5), and (c)(6) Organizations Unlike Super PACs, they are not required to publicly disclose their donors.
A 501(c)(4) that runs ads supporting or opposing a candidate must report the spending to the FEC, but it does not have to reveal where the money came from. Voters see the ad and the group’s name, but not the individuals or corporations behind it. A donor who wants anonymity can give to a 501(c)(4), which can then spend on elections or contribute to a Super PAC, effectively removing the original donor’s identity from the public record. This is what is commonly called “dark money.” The Court’s 8-1 endorsement of disclosure was framed as a check on exactly this kind of opacity, but because disclosure obligations attach to the spending organization rather than its underlying donors, the practical result has been less transparency than the majority opinion described.
Spending After the Ruling
Outside spending in federal elections has climbed sharply since 2010. In 2008, the last presidential cycle before the ruling, total outside spending was roughly $574 million. It more than doubled to nearly $1.3 billion in 2012, reached approximately $3.3 billion in 2020, and approached $4.5 billion in 2024.
Not all of that growth is directly attributable to Citizens United. Political spending was already rising, and digital advertising and sharper partisan competition contributed. But the legal permission for corporations, unions, and wealthy individuals to channel unlimited funds through Super PACs and dark money groups accelerated the trend. The case changed who could spend, how much, and how much of that spending the public would ever be able to trace back to its source.