What Is a Class Action? A Plain Guide to Group Lawsuits

You may have received a postcard or email telling you that you are a member of a class in a lawsuit you never filed. Perhaps it involved a product, a data breach or a fee charged by a company you did business with. That notice is the most visible sign of a class action, one of the most important and least understood tools in American civil litigation.

This guide explains what a class action is, how a court decides whether a case can proceed as one and what it means for people who are included. It is general information, not legal advice.

The Basic Idea

A class action is a lawsuit in which one or more people, called class representatives or named plaintiffs, sue on behalf of a larger group of people who have similar claims. The larger group is called the class. If the case succeeds or settles, the result generally binds everyone in the class, not just the people whose names appear on the complaint.

Class actions exist because some harms are widespread but small for each person. Few people would hire a lawyer to recover a modest overcharge. When thousands or millions of people suffered the same overcharge, combining their claims can make the case practical and allow courts to resolve the common question once instead of many times.

How a Court Certifies a Class

A case does not become a class action simply because the complaint says so. The court must certify the class. In federal court, Rule 23 of the Federal Rules of Civil Procedure sets the requirements, and many states have similar rules.

Under Rule 23, the party seeking certification must show four basic things. The class must be so numerous that joining everyone individually is impractical. There must be questions of law or fact common to the class. The claims of the representatives must be typical of the class. And the representatives and their lawyers must fairly and adequately protect the interests of the class.

The case must also fit one of the types described in Rule 23. A common type, used in many cases seeking money damages, requires that common questions predominate over individual ones and that a class action be superior to other ways of resolving the dispute. Certification is often the most heavily contested stage of the case, because it can determine whether the lawsuit continues at all.

Notice and the Right to Opt Out

In class actions seeking money damages, members of the class generally must receive the best notice practicable under the circumstances. That is why people receive mailed postcards, emails or see published notices about cases they never joined.

Members of these damages classes usually have the right to opt out, meaning they can exclude themselves from the class. A person who opts out keeps the right to bring an individual lawsuit but gives up any share of the class recovery. A person who stays in typically shares in any recovery but is bound by the outcome and cannot sue separately on the same claims. Notices include deadlines for these choices, and missing them can matter.

Settlements and Attorney Fees

Many class actions end in settlement rather than trial. Because a settlement affects people who are not in the courtroom, a judge must approve it. Under Rule 23, the court may approve a settlement only after finding that it is fair, reasonable and adequate. Class members may file objections, and the court often holds a fairness hearing before deciding.

Attorney fees in class actions are also subject to court approval. Judges review whether the requested fees are reasonable in light of the work done and the benefit to the class. In many courts, class representatives may also receive a modest service award for their role, again subject to approval.

Where Class Actions Are Heard

Class actions can be filed in state or federal court. The Class Action Fairness Act of 2005 expanded federal court jurisdiction over many large class actions, particularly those involving more than five million dollars in total and parties from different states.

Some contracts limit class actions. Many consumer and employment agreements include arbitration clauses that require disputes to be resolved individually. The Supreme Court has upheld such clauses in a number of cases, which means some claims that might once have proceeded as class actions now go to individual arbitration instead.

What to Do If You Receive a Notice

Read it carefully and check whether it is genuine, usually by looking up the case on the official settlement website or court records rather than clicking unfamiliar links. Note the deadlines for filing a claim, opting out or objecting. If the amount at stake for you is significant or your situation is unusual, consider speaking with a lawyer before deciding.

Class actions are a powerful way for ordinary people to pursue claims they could never bring alone. Understanding how they work helps you make informed choices when your name is on the list.