An employee will generally have a grievance about another employee, which may result in disciplinary action and internal investigations. Your policies will dictate how you respond to these issues. If you do not have any policies then we encourage you to use the principles of natural justice.
If an employee has a grievance you should stop and genuinely consider their grievance. If it is about another employee, you may propose disciplinary action against that employee and commence internal investigations (if appropriate). It is important to remain impartial and consider only the facts at hand when working through internal investigations to ensure a fair outcome is achieved for all parties.
Although not recommend, you could ignore the issue and hope that the employee who complained withdraws their complaint. It is unlikely that this will occur though because by the time an employee has made a complaint the matter would have gone quite far. It is a good idea to consider what is happening and who it is happening to, think about the sort of support you need to give and consider your responsibilities under current work health and safety legislation.
We can assist you with handling employee grievances, disciplinary matters and investigations. It may be difficult for you to remain impartial throughout the process so it may be prudent to engage external assistance.
All allegations are serious but some require you to protect the employee more than others. We recommend that you consider your work health and safety responsibilities as well as your responsibilities to investigate.
If you have undertaken an investigation and found that the allegation was false you need to figure out what the motives of the employee making the false allegation were. Once you have all the information you can make informed decisions as to what to do next.
Adversely treating an employee for exercising a workplace right is a breach of the Fair Work Act 2009 (Cth). Consider the complaint in the usual way so that you can protect your business from exposing itself from liability.