A manager at my husbands work has several complaints made against her and the Human Resources team have forwarded these on to the said manager and named and shamed the people complaining? Is there a law against?
nope unless the people telling HR the complaints told them not to disclose their personal information. the person accused has the right to face their accuser.
Only if they have a privacy policy in place, which means the would have violated it, otherwise the information belongs to them, they can do with it as they please.