Just looking for some advice about events in my workplace. Some info - I work as a manager for a large company in the retail sector and have done for 8+ years. This company has many outlets in this country and the world. In the past few years a senior manager left, (constructive dismissal - they actually won their case) and was replaced by another. This person has done nothing but bully many many people since day one to the point that in the past year 11 managers from one small area alone with well over 100 years experience at the company between them have resigned. In virtually all cases, (I know this as fact), they have stated this manager was their reason for leaving. HR department are well aware of the situation and in fact have even complained about this person also.
What I want to know is, although it's difficult to be successful in a constructive dismissal case would these people improve their chances if they banded together? And also, why would a multinational company do absolutely nothing about the situation?
Thanks in advance