Anti-social and unethical behaviour in the workplace has considerable negative effects on employee wellbeing. Toxic relationships are at the heart of such behaviour. This column presents evidence from a field experiment carried out in Turkey. In this setting, an innovative training programme aiming to improve the relational atmosphere in the workplace reduced anti-social interactions and lowered employee separation in large corporations. In particular, improved leader-subordinate relationships played a key role in explaining the programme’s positive impacts on the workplace climate.