The Supreme Court gave corporations a major win [on April 27], ruling in a 5-4 decision that companies can block their disgruntled customers from joining together in a class-action lawsuit. The ruling arose from a California lawsuit involving cellphones, but it will have a nationwide impact. In the past, consumers who bought a product or a service had been free to join a class-action lawsuit if they were dissatisfied or felt they had been cheated. By combining these small claims, they could bring a major lawsuit against a corporation. But in [the] decision, the high court said that under the Federal Arbitration Act companies can force these disgruntled customers to arbitrate their complaints individually, not as part of a group. Consumer-rights advocates said this rule would spell the end for small claims involving products or services. Justice Antonin Scalia said companies may require buyers to sign arbitration agreements, and those agreements may preclude class-action claims. But the dissenters said a practical ban on class action would be unfair to cheated consumers. Justice Stephen G. Breyer said the California courts had insisted on permitting class-action claims, despite arbitration clauses that forbade them. Otherwise, he said, it would allow a company to insulate" itself "from liability for its own frauds by deliberately cheating large numbers of consumers out of individually small sums of money."