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, holding 5-4 that the First Amendment protects such spending as political speech. The ruling did not touch the ban on giving money directly to candidates, but it cleared the way for Super PACs, unlimited outside spending, and the system of undisclosed political money that critics call “dark money.”
How the Case Started
During the 2008 presidential primaries, a conservative nonprofit called Citizens United produced “Hillary: The Movie,” a documentary sharply critical of then-Senator Hillary Clinton. The group wanted to distribute it through video-on-demand. The Federal Election Commission blocked the broadcast under the Bipartisan Campaign Reform Act, which prohibited corporations from spending general treasury funds on “electioneering communications” — broadcast ads naming a federal candidate within 30 days of a primary or 60 days of a general election.1Federal Election Commission. McConnell v FEC Citizens United was incorporated, so the ban applied.
The case started with narrow questions about whether the film even qualified as an electioneering communication. After a second round of oral arguments, the Supreme Court took up the far broader question of whether the government could ban corporate independent political spending at all.
What the Court Held
Justice Anthony Kennedy, writing for the five-justice majority, held that the First Amendment “prohibits Congress from fining or jailing citizens, or associations of citizens, for simply engaging in political speech.”2Federal Election Commission. Citizens United v FEC Spending money to produce and distribute a political message is itself protected expression, the Court reasoned, and the government cannot suppress that expression based on whether the speaker is an individual or a corporation.
The decision overturned two precedents. Austin v. Michigan State Chamber of Commerce (1990) had allowed states to ban corporate independent expenditures. The portion of McConnell v. FEC (2003) that upheld the electioneering communication restrictions was also swept away.2Federal Election Commission. Citizens United v FEC After January 21, 2010, corporations and unions could spend unlimited amounts from their general treasuries on ads supporting or opposing candidates, so long as that spending was independent of any campaign.
One line stayed put. Corporations still cannot contribute money directly to a candidate’s campaign committee. An organization can now spend $50 million on ads urging voters to elect a particular candidate, but it cannot hand that candidate a $5,000 check. The Court treated independent spending as less likely to corrupt than direct payments into a politician’s campaign account.
The Dissent
Justice John Paul Stevens, joined by Justices Ginsburg, Breyer, and Sotomayor, wrote a lengthy dissent. He rejected the idea that corporations should have identical speech rights to individuals. “Although they make enormous contributions to our society, corporations are not actually members of it,” Stevens wrote. “They cannot vote or run for office.”3Legal Information Institute. Citizens United v Federal Election Commission – Dissent
Stevens argued that corporate treasuries are built from business revenue, not from money people set aside for political advocacy, so corporate spending may not reflect the views of shareholders or employees. He warned the decision “threatens to undermine the integrity of elected institutions across the Nation” by unleashing spending that creates at least the appearance of corruption.3Legal Information Institute. Citizens United v Federal Election Commission – Dissent The dissent also pushed back on the majority’s framing that the law imposed a total “ban” on corporate speech, noting that corporations had long been free to speak through political action committees.
How the Ruling Applies to State Elections
Two years later, the Court confirmed the ruling reaches state laws too. In American Tradition Partnership, Inc. v. Bullock (2012), Montana defended a century-old state ban on corporate election spending, pointing to the state’s history of mining-company corruption. The Montana Supreme Court upheld the law; the U.S. Supreme Court reversed in a brief per curiam opinion, saying there was “no serious doubt” that Citizens United controlled.4Federal Election Commission. American Tradition Partnership Inc v Bullock State and local restrictions on corporate independent expenditures fell with it.
Super PACs
Citizens United created the principle. Two months later, the D.C. Circuit built the vehicle. In SpeechNow.org v. FEC, the court reasoned that if independent expenditures cannot corrupt, then contributions to groups that make only independent expenditures cannot corrupt either. Contribution limits on such groups were therefore unconstitutional.5Federal Election Commission. SpeechNow.org v FEC (Appeals Court)
Together, the two decisions produced what the FEC calls “independent expenditure-only political committees” — Super PACs.6Federal Election Commission. Registering as a Super PAC A Super PAC can accept unlimited money from individuals, corporations, unions, and other PACs, and spend it all on ads supporting or opposing candidates. What it cannot do is contribute directly to a candidate or coordinate its spending with a campaign. Super PACs must register with the FEC, disclose their donors, and file regular financial reports. In the 2024 election cycle, they reported spending roughly $2.7 billion on federal races.
Which Organizations Can Now Spend on Elections
The list of entities that can fund independent political ads from general treasury money is broad: for-profit corporations of all sizes, labor unions, trade associations, and most types of tax-exempt nonprofits.7Justia. Citizens United v FEC, 558 US 310 (2010) Among nonprofits, the most active are 501(c)(4) social welfare organizations, 501(c)(5) labor and agricultural groups, and 501(c)(6) trade associations and chambers of commerce.8Office of the Law Revision Counsel. 26 US Code 501 – Exemption From Tax on Corporations, Certain Trusts, Etc A 501(c)(4) can allocate part of its budget to political advocacy, provided political activity does not become its primary purpose.
One category stayed on the sidelines. Charities and other 501(c)(3) organizations remain absolutely prohibited from participating in any political campaign for or against a candidate. Violations can cost the organization its tax-exempt status and trigger excise taxes.9Internal Revenue Service. Restriction of Political Campaign Intervention by Section 501(c)(3) Tax-Exempt Organizations Citizens United did nothing to change that.
Dark Money
Super PACs must publicly disclose every donor. Politically active nonprofits, particularly 501(c)(4) social welfare organizations, generally do not have to reveal who funds them. When these groups spend on political ads, voters see the ad but often never learn who paid for it. This is what people mean by “dark money.”
Federal law requires any entity making independent expenditures above $250 to file reports with the FEC, and the statute calls for disclosure of contributors who gave $200 or more for the purpose of influencing a federal election.10Office of the Law Revision Counsel. 52 USC 30104 – Reporting Requirements Enforcement has been contentious. For years, FEC regulations narrowed the disclosure rule so nonprofits only had to report contributions earmarked for a specific independent expenditure, an easy rule to work around by not designating gifts. Recent court decisions have struck down that narrow interpretation and ordered broader donor disclosure from non-committee groups. The picture continues to shift.
The result is a two-track system. Super PACs operate with full donor transparency but can accept unlimited amounts. Certain nonprofits offer donors more privacy but face constraints on how much of their budget can go to politics. Some donors route money through nonprofits that then give to Super PACs, adding a layer between the original funder and the political spending.
What Citizens United Did Not Allow
The decision is often described as making political money limitless, and reading it that way overshoots. Several core prohibitions survived intact.
Direct contributions to candidates. Under 52 U.S.C. § 30118, corporations and unions still cannot give money directly to federal candidates or their campaigns, pay a candidate’s staff, buy campaign equipment, or provide anything of value the candidate uses at their discretion.11Office of the Law Revision Counsel. 52 US Code 30118 – Contributions or Expenditures by National Banks, Corporations, or Labor Organizations
Coordinated spending. An “independent” expenditure has to actually be independent. If a group’s ad is requested by the campaign, shaped through material involvement by campaign staff, informed by substantial discussions with the campaign, or produced through a media vendor also working for the candidate, the FEC can reclassify it as an illegal in-kind contribution.12Federal Election Commission. Coordinated Communications
Foreign money. Federal law bars foreign nationals from making any contribution, expenditure, independent expenditure, or payment for electioneering communications in any U.S. election at any level of government.13Office of the Law Revision Counsel. 52 USC 30121 – Contributions and Donations by Foreign Nationals “Foreign national” includes foreign governments, foreign political parties, foreign corporations, and individuals who are neither citizens nor lawful permanent residents. A U.S. subsidiary of a foreign parent can operate a PAC only if it is incorporated in the United States, spends domestic funds, and keeps foreign nationals out of election-related decisions.14Federal Election Commission. Foreign Nationals
Disclaimers on the ads themselves. Ads paid for by independent expenditures must state that no candidate authorized them and must identify the organization that paid, along with a permanent address, phone number, or website.15Federal Election Commission. Advertising and Disclaimers
Violating the corporate contribution ban or related rules can carry criminal penalties. Knowing and willful violations involving $25,000 or more in a calendar year are punishable by up to five years in prison, with lesser tiers for smaller amounts and enhanced penalties for conduit contribution schemes.16Office of the Law Revision Counsel. 52 USC 30109 – Enforcement Most enforcement ends in civil penalties negotiated through FEC conciliation agreements, but the Justice Department has used the criminal statutes against deliberate schemes to hide the source of political money.