Google CEO Sundar Pichai said the fired engineer's comments were not OK. Thomson Reuters James Damore, the Google engineer who was fired Monday for writing a controversial memo about diversity, has filed a complaint with federal labor officials.

The complaint against Google was filed on Monday according to the National Labor Relations Board website. While the site does not list Damore's name alongside the complaint, it lists the Paul Hastings LLP as the law firm representing Google.

A Paul Hastings representative confirmed that the firm was representing Google in the Damore case but declined to provide further comment.

It's not clear exactly what the complaint says, as the actual filing is not yet available online (and the NLRB site notes that the document may need to be redacted). The only specific information on the NLRB site about the nature of the complaint is the general classification for the type of allegation involved: "Coercive Statements (Threats, Promises of Benefits, etc.)"

The filing is not a complete surprise: Damore told Reuters and The New York Times on Monday night that he planned to file an NLRB complaint accusing Google's management of trying to silence him. Damore was fired from Google on Monday for violating the company's code of conduct.

Damore's 10-page manifesto, which went viral over the weekend and stirred passions across the political spectrum, accused Google of alienating conservatives at the company and attributed Google's lack of gender diversity to biological differences between men and women.

Damore did not respond to several emails requesting comment on Tuesday. Google has declined to comment on the situation beyond the memo CEO Sundar Pichai sent employees Monday night, in which he called some of Damore's statements "not OK."