I left my job as my new manager was a jerk and used to literally yell at me everyday and was extremely unfair and hostile. I told HR but they did not do anything . He found out and made it more horrible for me....so I left as it was a horrible toxic environment. In one of my job interviews I kept it neutral, I got the job offer, but somehow someone spoke to my ex manager and he gave a bad reference and they actually rescinded my job offer ...and I thought maybe I should have told the new employer the truth. Which I tried in another interview I told them the truth and they never came back. So the question is...what do you do and how to put forth your circumstance in interviews which the new prospective employer will understand. One learning for me.....better to leave the company rather then complain to HR as it never helps.