We evaluate the impact of a training program aimed at improving the relational atmosphere in the workplace. The program encourages prosocial behavior and the use of professional language, focusing primarily on leaders' behavior and leader-subordinate interactions. We implement this program using a clustered randomized design involving over 3000 headquarter employees of 20 large corporations in Turkey. We evaluate the program with respect to turnover rate, the prevalence of support networks, pro and antisocial behavior, and the perceived relational atmosphere. We find that treated firms have lower employee turnover, fewer employees lacking professional and personal help, and denser, less segregated support networks. We also find that employees in treated corporations are less inclined to engage in toxic competition, exhibit higher reciprocity toward each other, report higher workplace satisfaction and a more collegial environment. The program's success in improving leader-subordinate relationships emerges as a likely mechanism to explain these results. Treated subordinates report higher professionalism and empathy in their leaders, and they are more likely to consider their leaders as professional support providers.