What should I do if my former employer refuse to allow me to review and receive copies of personnel file?

I was laid-off recently from an employer whom I have worked with for approximately 3 years, various positions and different times. There was an outbreak of a foodborne illness disease causing bacteria traced to our production facility and the operation was shutdown by the FDA until protocols, food safety controls, and other measures are implemented. However, throughout part of my tenure with my former employer, and just prior to the layoff, attempts may have been made to belittle my work performance, false allegations made, and other scenarios that might affect perceptions that are not true. So I have reason to believe a disregard for me in the event of work recall after operations starts up again may takes place. So I drafted a request for my personnel file to review any reports or complaints that may have been made against me so that I can correct false information, add missing information and inspect for omitted documentation, and request only certain information is shared to others