Correction: This story has been corrected to reflect that the U.S. Supreme Court ruling in Wal-Mart v. Dukes was unanimous.

Representing Corporate America before the U.S. Supreme Court in a groundbreaking case is nothing new for Gibson, Dunn & Crutcher. In Wal-Mart v. Dukes, the firm convinced a unanimous high court on June 20 to toss out certification of the largest discrimination class action case in history. The court, which found the class lacked commonality, also ruled 5-4 that the plaintiffs could not go forward at all as a certified class.