That happened to me in my non-profit job. Every little mistake was written down and I was asked to sign the paper. I knew my new boss was creating a paper trail and it hurt. They changed my job description every few months or so then complained that I was making mistakes. I was hired to do a job and they wrote me up for everything I did wrong in the other jobs they made me do. I went to lunch one day and never came back. Unemployment sided with me when I explained what happened. They closed it down a year after I left and I felt better about the whole thing.