The US National Labor Relations Board (NLRB) has accused Apple of interfering with its employees’ right to collectively advocate for the improvement of working conditions through its strict policies regarding the use of social media and workplace messaging apps.

In its statement on Friday, the NLRB argued that the tech giant has maintained unlawful policies surrounding the acceptable use of workplace messaging software, requiring workers to delete social media posts, and creating the impression that workers were being monitored through social media.