Answer
Stephen Breyer served as a special assistant to the U.S. Assistant Attorney General for the Antitrust Division of the Department of Justice in the early 1960s. In this role, he helped investigate and prosecute antitrust cases, including those involving price-fixing, monopolization, and other anti-competitive practices. He also worked on antitrust legislation, including the Hart-Scott-Rodino Act of 1976, which established new rules for mergers and acquisitions.