What is a Class Action Lawsuit

A class action lawsuit is a type of legal action where a large group of people with similar claims sue a defendant together as a single collective case.

A class action lawsuit is a type of civil litigation in which a large group of individuals who have suffered similar harms sue one or more defendants collectively as a single unified case. Rather than filing hundreds or thousands of individual lawsuits, class members are represented by one or more lead plaintiffs (class representatives) and a shared legal team.

When Class Actions Are Used

Class actions are most common when:

A large number of people were harmed in the same or similar way
Individual damages are too small to justify individual lawsuits (e.g., overcharged by $10)
The harm stems from a common course of conduct by the defendant
A single case can resolve all claims more efficiently than individual suits

Common areas include:

Consumer protection — Defective products, false advertising, data breaches
Securities fraud — Stock price manipulation, misleading financial disclosures
Employment — Wage theft, discrimination across a large workforce
Pharmaceutical/medical devices — Dangerous drugs or devices sold to many patients
Antitrust — Price fixing that affected many consumers

Certification Requirements (Federal Rule 23)

Federal class actions must be certified by a court. The class must meet four requirements under Rule 23 of the Federal Rules of Civil Procedure:

Numerosity — Too many class members to practically join individually (typically 40+)
Commonality — Common questions of law or fact exist across the class
Typicality — The lead plaintiff's claims are typical of the class
Adequacy — The lead plaintiff and attorneys will fairly represent the class

Class Action Settlement

Most class actions settle rather than going to trial. Settlements must be approved by the court as fair, reasonable, and adequate.

In large class actions:

Attorneys may receive 25–33% of the total recovery
Individual class members may receive small checks ($5–$100)
Sometimes class members can opt out and sue individually for larger damages

Opt-Out vs. Opt-In Classes

Opt-out (most U.S. class actions) — All qualifying members are automatically included unless they opt out
Opt-in (some employment cases) — Members must affirmatively join the class

Famous Class Action Settlements

Tobacco industry settlements — Billions paid to states over public health costs
Volkswagen Emissions scandal — $25+ billion settlement
Enron securities fraud — Billions paid to defrauded shareholders