[crazygringo]

Companies are allowed to restrict speech by their employees about company information. Otherwise everyone would be allowed to leak every trade secret.

A manager's evaluation of another employee's performance is internal company information. There's no reason that a company should be compelled to share that information externally.

It doesn't matter if the manager wants to share it, any more than the manager wants to share all the source code the employee has written.

Companies are allowed to determine what gets shared by their current employees, end of story. On the other hand, it is unconstitutional for the government to override that.

There are exceptions for things like public companies that are compelled to release certain data on a quarterly basis in exchange for the benefits of being publicly traded. And plenty of information can be compelled to be shared privately with the government, whether taxes or for health inspections or whatever.

But absolutely not forcing companies to allow their employees to talk publicly about other employees' performance.