Investigator from full time job notified my part time job of allegations against me release of employment resulted.

I was accused of making threats and calling supervisors names. No charges were placed on me and it is under investigation. The criminal investigation division aboard a military based, I am a civilian, notified my part time employer of what was going on. My part time employer subsequently released me from employment. The part time employer also told me that the city manager was contacted by someone who he knows and informed him the same. I have my suspicion that it is my supervisor at my full time job. Do I even have a case? The allegations are not criminal, at least that is what I was told. Furthermore, the contacting of an outside agency not connected seemed unwarranted.