Major law firms are getting involved in an antitrust battle between state attorneys general and Facebook’s parent company Meta before the U.S. Court of Appeals for the D.C. Circuit.

Big Law represents technology and business organizations as well as economists and legal scholars in six amicus briefs that landed on the docket Monday. The groups are backing Facebook as it fights an attempt by nearly every state attorney general to revive an antitrust lawsuit alleging that Meta has maintained an illegal monopoly in the social networking market.