Suppose you are an employer. Employee A accuses B of committing a "firing offense." You fire B on A's say-so, without investigating to see if the charge is true. Maybe you trust, or even like A more than B.
It turns out that A slandered B, who is not guilty of a "firing offense." B can sue A for slander. Can B sue you for acting on A's slander in 1) an "employment at will" state and 2) a state where there is no employment at will?
And are there any western countries where the above facts would not support liability for slander, and therefore you could not be named in a derivative suit?
This question was inspired by this one on Academia, where the OP did not disclose his country.