A federal judge in Chicago on Wednesday ruled that home sellers accusing the National Association of Realtors and a group of real estate brokerages of conspiring to inflate commission rates can move forward as a class action. U.S. District Judge Andrea Wood's decision grants class-action status to past home sellers seeking more than $13 billion in damages and creates a separate class of current and future sellers who want a court injunction that bars subsequent violations of U.S. antitrust law. The plaintiffs are seven home sellers.