Citizens United v. FEC: The Ruling, Super PACs, and Dark Money

Citizens United v. FEC is the 2010 Supreme Court decision that struck down federal limits on how much corporations and unions can spend independently to support or oppose political candidates, holding that such spending is protected speech under the First Amendment. The 5-4 ruling reshaped campaign finance by clearing the way for Super PACs and unlimited outside spending in federal elections, while leaving intact the ban on direct corporate contributions to candidates and the disclosure rules for political ads.

The Case Behind the Ruling

The dispute began with a documentary. In 2008, a nonprofit called Citizens United produced Hillary: The Movie, a sharply critical film about then-presidential candidate Hillary Clinton. The group wanted to distribute it through video-on-demand and promote it with television ads in the weeks before the primaries.

The Federal Election Commission blocked the plan under the Bipartisan Campaign Reform Act of 2002, better known as McCain-Feingold. That law prohibited corporations and unions from using general treasury money to pay for broadcast communications mentioning a federal candidate within 30 days of a primary or 60 days of a general election, when the ad reached at least 50,000 people in the relevant state or district.¹ Citizens United sued, arguing the restriction violated the First Amendment as applied to a documentary funded by a nonprofit corporation.²

What the Supreme Court Held

In January 2010, the Court ruled 5-4 that the government cannot suppress political speech based on the speaker’s corporate identity. Justice Anthony Kennedy wrote the majority opinion, joined by Chief Justice Roberts and Justices Scalia, Alito, and Thomas in part.² Corporations and unions, the majority reasoned, are associations of people entitled to First Amendment protection, and spending money to advocate for or against a candidate is a form of political speech.

The opinion drew a firm line between two kinds of spending. Direct contributions to a candidate’s campaign can still be limited because they create a risk of corruption or the appearance of it. Independent expenditures, made without any coordination with a candidate, do not pose that same risk in the majority’s view. On that logic, the Court overruled its earlier decision in Austin v. Michigan Chamber of Commerce and the portion of McConnell v. FEC that had upheld the corporate electioneering ban.²

The practical bottom line: corporations, unions, and nonprofits could now spend unlimited amounts from their general treasuries on political ads, films, and other communications, so long as the spending stayed independent of any campaign.

The Dissent

Justice John Paul Stevens wrote a long dissent joined by Justices Ginsburg, Breyer, and Sotomayor. He rejected the idea that corporations deserve the same speech protections as individuals in elections, noting that corporations cannot vote or run for office, may be controlled by nonresidents, and have financial resources and legal structures that raise concerns unique to them.³

Stevens also took aim at how the majority defined corruption. The Court had limited the government’s anti-corruption interest to something close to explicit exchanges of money for favors. Stevens called that a “crabbed view of corruption” and argued that influence operates along a spectrum. Members of Congress, he wrote, routinely learn when outside groups run ads on their behalf and express gratitude for the spending, and that softer form of influence can distort politics even without an overt deal.³ The dissent predicted a surge in outside spending that ordinary voters would have little power to counter.

What the Ruling Did Not Change

Citizens United is often described as if it demolished campaign finance law. It did not. Two important pieces survived.

First, the ban on direct corporate and union contributions to federal candidates from general treasury funds remains in force under 52 U.S.C. § 30118.⁴ A company still cannot write a check to a candidate’s campaign. Organizations that want to give directly must set up a separate Political Action Committee funded by voluntary contributions from employees or members, and those PACs face per-election caps set by the FEC.⁵

Second, disclosure survived, and by a wide margin. Eight of the nine justices supported the McCain-Feingold provisions requiring political ads to identify their sponsor and requiring groups that spend on elections to report to the FEC.⁶ Political committees must file periodic reports listing every receipt and expenditure, and disclose the names, addresses, occupations, and employers of donors who give more than $200 in a calendar year.⁷ Ads paid for by independent spenders must state that they were not authorized by any candidate.

How Super PACs Grew Out of the Decision

Citizens United did not itself create Super PACs. The missing piece came a few months later, when the D.C. Circuit decided SpeechNow.org v. FEC. That court reasoned that if independent expenditures cannot corrupt, as the Supreme Court had just held, then contributions to groups that make only independent expenditures cannot corrupt either, so limits on those contributions violate the First Amendment.⁸

Together, the two rulings produced Independent Expenditure-Only Committees, commonly called Super PACs. These committees can raise unlimited sums from individuals, corporations, and unions, but they operate under two hard rules:

They cannot donate to candidates or political parties.
They cannot coordinate their spending, messaging, or strategy with the candidate they support. Coordinated spending is treated as an illegal in-kind contribution.

Super PACs must register with the FEC and file regular reports disclosing receipts and disbursements, including donor information for contributions over $200.⁷ The coordination rule is where most of the legal risk sits. The line between genuine independence and quiet coordination can blur, and enforcement depends on whether investigators find shared consultants, strategic discussions, or material produced at a candidate’s request.

The Dark Money Gap

The most contested downstream effect of the ruling has been the growth of political spending by 501(c)(4) social welfare nonprofits. These groups can engage in political activity as long as it is not their primary purpose. The IRS has not defined “primary” with a specific number, though tax practitioners generally advise keeping political spending under roughly 40 percent of total activity.⁹

What makes 501(c)(4) spending distinctive is donor anonymity. A Super PAC must publish its contributor list; a 501(c)(4) generally does not. A social welfare organization can also donate to a Super PAC, adding a layer between the original donor and the reported source. This is the money commonly called “dark money.” Nothing in Citizens United required this result; the Court endorsed disclosure. The anonymity exists because 501(c)(4)s operate under IRS rules rather than FEC contributor-reporting rules, and Congress has not closed the gap.

Foreign Money Is Still Off Limits

The ruling did not extend to foreign nationals. Federal law prohibits any foreign national from making a contribution, independent expenditure, or electioneering communication in any federal, state, or local election, and also bars anyone from soliciting or accepting such money.¹⁰ The prohibition covers foreign governments, foreign parties, foreign corporations, and individuals who are neither U.S. citizens nor lawful permanent residents.

A U.S. subsidiary of a foreign-owned company sits in a more complicated position. As a domestic entity it can form a PAC funded by voluntary contributions from U.S. employees, but no foreign national may take part in the PAC’s spending decisions, and no foreign money may enter it. Policing that boundary has been a persistent enforcement challenge.

How the Surviving Rules Are Enforced

The FEC handles most campaign finance complaints administratively, which can end in conciliation agreements and civil fines. Standard civil penalties cannot exceed the greater of $5,000 or the amount of the illegal contribution or expenditure. Knowing and willful violations raise the ceiling to the greater of $10,000 or 200 percent of the amount involved, and violations that route contributions through straw donors carry penalties of at least 300 percent and up to 1,000 percent of the sum involved.¹¹

When a knowing and willful violation exceeds $25,000, the FEC can refer the case to the Attorney General for criminal prosecution, with a maximum prison sentence of five years. Violations above $10,000 but under $25,000 carry a maximum of two years.¹¹

Enforcement has practical limits. The six-member FEC needs four votes to act on a complaint and frequently deadlocks along partisan lines, so many complaints are dismissed without a formal finding. Critics argue that the deadlock pattern has weakened the very rules Citizens United left standing.

1
Federal Election Commission. Final Rules and Explanation for Electioneering Communications
2
Justia U.S. Supreme Court Center. Citizens United v FEC, 558 US 310
3
Cornell Law Institute. Citizens United v Federal Election Commission – Dissent
4
Office of the Law Revision Counsel. 52 USC 30118 – Contributions or Expenditures by National Banks, Corporations, or Labor Organizations
5
Federal Election Commission. Contribution Limits for 2025-2026
6
Cornell Law Institute. Citizens United v Federal Election Commission
7
Federal Election Commission. SpeechNow.org v FEC
8
Federal Election Commission. SpeechNow.org v FEC – Appeals Court
9
Internal Revenue Service. Political Activity and Social Welfare
10
Office of the Law Revision Counsel. 52 USC 30121 – Contributions and Donations by Foreign Nationals
11
GovInfo. 52 USC 30109 – Enforcement