I always knew I was fired due to the fact that I was the one who told several employees to file complaints to HR due to all the harrasment and discrimination.
I assume that you merely suspect this and don't really "know" it and have no evidence to prove it. Correct?
I was recently contacted by their manager that stated to me that the company owner became angry after I won the unemployment appeal. Therefore they were filing theft charges against me and that they strong armed people to sign affidavits against me. She also stated that she has proof if all of this, she said she has all email correspondences between her, HR and the owner of the company. Please let me know if anything can be done or what needs to be done.
Your former employer cannot "fil[e] theft charges." The employer can make a report to the police, and the police will decide whether or not to investigate and whether or not to refer the matter to the prosecutor, who will then decide whether or not to file charges. As far as the rest of this, you're free to ask the person who called you to provide you with whatever "proof" she claims to have so that you can make use of it if/when charges are ever filed.
To answer the question asked in the subject header of your thread but did not ask in the post itself, no.