If someone in a team has a toxic and demotivating effect on others, it is a problem that affects everybody. And it is even worse if that someone happens to be a manager. Unfortunately, despite the best efforts of top management, someone with a toxic leadership style who spreads bad moods still might be promoted to a leading function. This causes gradual demoralisation of the team and subsequent poor results. Here are some signs of such a toxic leadership style and tips on what to do about it.