Apple is being accused of monitoring employee’s interactions on Slack and putting unlawful restrictions on conversations.

Apple Inc. unlawfully fired an employee at its headquarters in Cupertino, Calif., over using messaging app Slack to push for workplace changes, a federal labor board official alleged in a complaint announced Friday.

The U.S. National Labor Relations board accused Apple of interfering with workers' rights to collectively advocate for better working conditions by restricting their use of social media and workplace messaging app Slack,

The NLRB is accusing Apple of maintaining unlawful work rules around the acceptable uses of work messaging app Slack, terminating an employee who advocated for workplace changes on Slack, forcing another worker to delete a social media post, and creating an environment where employees felt surveilled on social media, Reuters reported.

Apple faces allegations from the NLRB for restricting employees' social media use and firing a worker for using Slack in the workplace. The tech giant denies all claims.

The National Labor Relations Board (NLRB) filed a complaint against Apple Thursday, accusing the iPhone maker of improperly restricting workers’ use of Slack and other social media. The agency alleges that Apple fired an employee for advocating for workplace changes on Slack and maintained unlawful rules about acceptable uses of the platform,

Apple is under fire for allegedly restricting its employees’ communication and stopping them from advocating for better working conditions.