You can sue for the actual damages you suffered, which you can prove to a jury at trial. A personal injury lawyer can tell you what you may be awarded based on your particular claim.
Your grammar is off, but I think you are asking if someone makes a false statement about your character, can you sue them for defamation?
The basic answer is yes, but it of course depends on many...
I recommend checking with your Union rep first, but yes you could. You probably won't get anywhere unless you have lots of documentation.
Answer.
The situation sounds like this character is...