Employee silence
Employee silence refers to situations where employees withhold information that might be useful to the organization of which they are a part, whether intentionally or unintentionally. This can happen if employees do not speak up to a supervisor or manager. Within organizations people often have to make decisions about whether to speak up or remain silent - whether to share or withhold their ideas, opinions, and concerns ... [The problem is that] in many cases, they choose the safe response of silence, withholding input that could be valuable to others or thoughts that they wish they could express.— Frances J. Milliken and Elizabeth Wolfe Morrison, Shades of Silence: Emerging Themes and Future Directions for Research on Silence in Organizations

This means the situation is not going to change for the better anytime soon. Employee silence does not only occur between management and employees, it also occurs during conflict among employees, and as a result of organizational decisions. This silence keeps managers from receiving information that may help to improve the organization.