I sit in our sales corporate office with another manager, and I've noticed that she plays obvious favorites with people on her team. Instead of giving out leads evenly as they come in, she distributes them all to the one rep, who is also her friend. Normally I don't care what other managers and their teams are doing, but my team is very aware this is happening and has become obsessed with the unfairness of it. Some of them have asked me to do something about it. I'm not sure how to engage here - any suggestions?