Facebook whistleblower Frances Haugen has received widespread attention in recent days for leaking internal documents that led to bombshell investigative reports in the Wall Street Journal and a much-watched hearing in a Senate subcommittee.

Another move Haugen made, prior to revealing herself and her documents to the public, has received far less attention. She went to the Securities and Exchange Commission, submitting internal company documents through the commission’s whistleblower program, which allows tipsters to anonymously disclose information about potential securities law violations.