This casebook focuses on one of the most important and dynamic areas of modern federal civil practice—aggregate-party litigation, particularly class actions and multidistrict litigation. The casebook covers the latest groundbreaking Supreme Court cases involving employment discrimination, arbitration, expert testimony, "pick offs" of class representatives, aggregate proof of damages, and securities fraud. The book not only provides cutting-edge cases, it also explores litigation strategies used by practitioners and examines the theories underlying complex, multi-party litigation. As such, the book is ideal for practitioners, as well as students and faculty. One unique feature of the book is that it has separate, in-depth sections on mass torts, employment discrimination, and securities fraud. It also has sections that address a host of non-class aggregation devices, including joinder, consolidation, intervention, interpleader, impleader, bankruptcy, derivative suits, and suits involving unincorporated associations.