A political action committee, commonly shortened to PAC, is an organization that raises and spends money to influence elections. PACs are among the most familiar and most misunderstood actors in American campaign finance. They have existed for the better part of a century, they operate under detailed federal rules, and they file regular public reports that disclose where their money comes from and where it goes. Understanding what a PAC is, how it formed historically, and how it reports its activity is essential to making sense of the numbers that appear in any campaign finance database.
The first organization widely recognized as a political action committee appeared in 1943. During World War II, Congress passed the Smith Connally Act, which barred labor unions from contributing directly to federal candidates from their general treasuries. In response, the Congress of Industrial Organizations, a major labor federation, created a separate political fund that raised voluntary contributions from union members and used that money to support favored candidates, including President Franklin Roosevelt in the 1944 election. This CIO political action committee became the model for a new kind of organization, one that pooled many small voluntary contributions into a single fund directed toward political ends.
The model spread over the following decades, but the modern legal framework for PACs took shape in the 1970s. The Federal Election Campaign Act of 1971 established new disclosure requirements for federal campaigns. After the Watergate scandal exposed widespread abuses in campaign fundraising, Congress passed sweeping amendments in 1974 that set contribution limits, tightened reporting rules, and created the Federal Election Commission to enforce the law. These reforms gave PACs a clear legal status and a defined set of boundaries, turning them into a regulated and permanent feature of federal elections.
Federal law recognizes several categories of PAC, but the most basic distinction is between connected and nonconnected committees. A connected PAC is sponsored by a corporation, a labor union, a trade association, or a similar organization. These are often called separate segregated funds, because the law requires the political money to be kept separate from the sponsoring organization's general treasury. A corporation may not give its own corporate funds to candidates, but it may pay the administrative costs of running a PAC and may solicit voluntary contributions from a defined group, such as its executives, shareholders, or employees.
The ability of corporations to operate PACs in this way was clarified in 1975, when the Federal Election Commission issued an advisory opinion in a matter involving the Sun Oil Company, often referred to as the SunPAC opinion. That ruling confirmed that a corporation could use its treasury funds to establish and administer a PAC and to solicit contributions from employees, as long as the contributions themselves were voluntary and came from individuals rather than from corporate funds. The decision encouraged a rapid growth in the number of corporate and trade association PACs over the following years.
A nonconnected PAC, by contrast, has no sponsoring organization. It is a standalone committee, often built around an issue, an ideology, or a particular cause. Because it has no parent organization to pay its overhead, a nonconnected PAC must cover its own administrative costs out of the money it raises, and it may solicit contributions from the general public rather than only from a restricted group.
One of the defining features of a traditional PAC is that it operates within contribution limits set by federal law. A PAC that qualifies as a multicandidate committee, meaning it has received contributions from a sufficient number of people and has given to several candidates, may contribute a capped amount to a federal candidate for each election. For many years that limit has been set at 5,000 dollars per candidate per election, with the primary and general elections counted separately. Individuals who wish to support a PAC are likewise limited in how much they may give to it each year.
These limits are central to what makes a traditional PAC different from the newer independent spending groups that emerged after 2010. A traditional PAC can give money directly to a candidate's campaign, but only in limited amounts. In exchange for accepting those limits, it is permitted to make direct contributions and to coordinate openly with the campaigns it supports. The trade off between contribution limits and the right to give directly to candidates is one of the foundations of the federal system.
Disclosure is the heart of the federal campaign finance system, and PACs are subject to extensive reporting requirements. Every federal PAC must register with the Federal Election Commission and must file regular reports detailing its financial activity. These reports identify the money the committee has raised and the money it has spent. For contributions above a modest threshold, the committee must itemize the donor, recording the name, address, occupation, and employer of each individual who gives more than 200 dollars in a year, along with the date and amount of the contribution.
On the spending side, PACs must report the contributions they make to candidates and other committees, as well as their operating expenditures. Depending on the committee and the point in the election cycle, reports may be filed on a quarterly or monthly schedule, with additional reports required close to an election. All of this information becomes part of the public record and is made available through the Federal Election Commission, where anyone can examine it.
This transparency is what makes a campaign finance tracker possible. When a database shows that a particular candidate has received funds from various committees, that information ultimately traces back to the disclosure reports that PACs are legally required to file. The system is designed so that voters, journalists, researchers, and opponents can all see who is funding whom.
It is useful to be precise about the boundaries that govern traditional PACs. A traditional PAC may contribute directly to candidates within the legal limits, may give to party committees and other PACs within applicable limits, and may spend money on its own communications. It may also coordinate its activities with the campaigns it supports. What it may not do is exceed the contribution limits or, in the case of a corporate or union connected PAC, raise money from sources outside the group it is permitted to solicit. These rules keep traditional PACs within a defined and disclosed lane.
In an era of large independent spending groups, traditional PACs can seem modest by comparison, since their direct contributions are capped at relatively small amounts. Yet they remain important for several reasons. They aggregate the preferences of many individual contributors into organized support. They provide a transparent and disclosed channel through which interest groups, businesses, and labor organizations participate in elections. And the contributions they make go directly to the candidates' own campaigns, which the candidates control, unlike the spending of outside groups. For all of these reasons, the activity of PACs is a meaningful indicator of where organized financial support is flowing, and it remains a core part of the campaign finance picture that any serious tracker must capture.
See it in the data: Our 2026 Campaign Finance Tracker breaks down each candidate's funding, including how much comes from PACs versus individual donors, live from the FEC.