Many of us are familiar with Miranda Priestly, the fictional character from the novel The Devil Wears Prada, who treats her subordinates in a manner that borders on emotional and psychological abuse. Unfortunately, these types of managers exist in the real world and HR and benefit managers should keep a watchful eye when filling or evaluating managing roles in the company. Aaron Hurst, CEO of Imperative, a research and consulting firm that advocates for a purpose-oriented workforce, says the No. 1 reason people leave a job is because of their manager. Here are some of the worst types of managers.