The most successful and productive team can be brought down by a bad apple. Toxic behaviour from a single employee can create a level of drama and distraction which can suck all positive and creative energy from a room.
If you have identified a pattern of behaviour such as bullying, passing blame or constant negativity from an employee, it is time to provide direct feedback and help protect your team from a negative atmosphere.
The key is to approach the employee in an empathetic manner and talk candidly. This resource provides a guide on how to spot toxic behaviour in the workplace and what to do when faced with a toxic employee.