Since I started to work for my first employer, I have seen two employees quit the organization. What surprised me was that news of their exit was broken by team managers' only a week before the actual exit happened. Until then, even the closest of their friends were unaware of the developments.
Our employment terms state that an employee has to tender an exit notice of 45 days, so the fact these employees were leaving was known by management for quite some time. After speaking to outgoing employees, I found out that they were strictly instructed by their managers not to disclose the information that they were leaving until they were permitted to do so.
What are the business reasons for managers to give these instructions?