The Meta whistleblower Sarah Wynn-Williams is suing the tech company over its efforts to “silence” her.

A 57-page complaint filed to the US district court for the Northern District of California on Thursday argued that the interim arbitration ruling sought by Meta preventing Wynn-Williams from publicising her memoir, Careless People, was “improper and unlawful” and a “blatant violation of the first amendment”. It also accused the technology company of “coercive surveillance”.

Wynn-Williams, who between 2011 and 2018 served as director of global public policy at Facebook, published her memoir of her time at the company in March 2025. The book contained allegations of a toxic internal culture, including sexual harassment and gender-based discriminatory practices. The company has described the book as a “mix of out-of-date and previously reported claims about the company and false accusations about our executives”.

Upon publication, Meta sought an emergency order preventing Wynn-Williams from promoting the book, on the basis that she had signed a severance agreement, which included arbitration and non-disparagement clauses.

Thursday’s complaint, accompanied by a 285-page declaration by Wynn-Williams, argues that the severance agreement is unenforceable partly because it was signed under financial duress. When Wynn-Williams was fired from Facebook in August 2017, the company “knew” that her termination would take away “critical employment benefits” – which the complaint describes as “cornerstones of her financial stability” – meaning she “had no choice” but to accept the severance agreement, allowing her to retain many of the benefits and obtain a significant cash payment.

In late May, Wynn-Williams appeared at Hay literary festival in Wales alongside the journalist Carole Cadwalladr and the academic Tim Wu, but did not speak based on legal advice. Despite this, Meta wrote to the merits arbitrator on 12 June to request that it impose additional sanctions based on her appearance, the complaint revealed.

According to Meta’s arbitration submissions, its representatives have attended Wynn-Williams’ public appearances, “assembled photographs and written records of her movements, and traveled the length of the United Kingdom to do so – including making the long journey to rural Wales for the Hay festival – all to document that at each event, Ms Wynn-Williams said nothing about Meta or her book”, states the complaint. The company has also asked the merits arbitrator to force Wynn-Williams to disclose a list of her planned public appearances, it continues.

After Wynn-Williams’s Hay appearance, sales of her book saw a 304.5% week-on-week boost. Since publication, more than 150,000 copies of Careless People have been sold across all formats in the UK, according to Pan Macmillan.

Meta was “pursuing” Wynn-Williams “not only because she refused to bow to the greed and power of Meta, Mr Zuckerberg, and other executives, but also to strike fear into the heart of anyone else who dares to consider speaking the truth about Meta’s unlawful and abusive practices in the public interest”, stated Thursday’s complaint.

In a statement, Meta said: “This former employee is trying to use the legal process to sell books, which an arbitrator already ruled broke the agreement she signed with the company when she accepted a large financial settlement years ago.”

Mike Harpley, the nonfiction publisher at Macmillan and Wynn-Williams’s UK editor, said the filing “details how Meta has enforced its legal order against Sarah Wynn-Williams with a chilling campaign of surveillance. Careless People raises crucial issues for society and Meta’s actions prevent necessary public conversation in the UK and beyond.”

Ravi Naik, the legal director of AWO Legal and Wynn-Williams’ UK lawyer, said that Meta used a private arbitrator to “silence” the whistleblower. “No judge, no trial and no finding that she said anything untrue. Just a secret proceeding between an arbitrator and one of the most powerful corporations in the world.”

“This is the first time Sarah has been able to explain to the world what has happened to her,” he said of Thursday’s complaint. “The court filings record the facts of what Sarah has been subjected to and lay bare the extent to which Meta has gone to silence her”.