A manager at Royal Edinburgh Hospital has been suspended and an inquiry launched into allegations of intimidation and bullying of nursing staff.
A spokesperson for the Royal College of Nursing said elderlycare manager Danny Harvie had been suspended 18 months after nursing staff lodged complaints.
They allege he sent threatening letters to staff on sick leave and interrogated them in public about their absences.
A trust spokesperson confirmed that a manager had been suspended.
He stressed that although an inquiry was taking place it was not a disciplinary matter.
The RCN says that Edinburgh Healthcare trust suspended Mr Harvie after 20 senior charge nurses at the psychiatric hospital lobbied senior managers about their concerns and tabled a vote of no confidence in him.
It also claims staff-side representatives raised a collective grievance about managers in the care of the elderly department in 1996 but the trust did not investigate the claims.