Palsgraf v. Long Island Railroad Co. is a landmark case in U.S. tort law that established the principle of foreseeability in negligence claims. This 1928 case involved an incident where a woman was injured at a train station after a package containing fireworks fell and exploded due to the actions of railroad employees. The ruling clarified that liability in negligence cases depends on whether the harm to the plaintiff was a foreseeable result of the defendant's actions, influencing both negligence and intentional torts by emphasizing the need for a direct link between conduct and injury.