I'm not a lawyer but believe you could take him to civil court. Sounds like 'defamation' of character. Also need to know your labor laws for your state.
Some states have laws that limit what a former employer can say about a former employee. Some states have "blacklisting" laws which means a former employer who intentionally blocks you from new employment. Also what are the companies policies?
Some state you can only mention if the former employee is "rehireable".
If you are in the US, my suggestion is to get to a government employment office and tell them what is going on. Some states have fair Housing & Employment offices. Other states may differ but all should have someone in charge of this type of thing.
If it is impacting your ability to get a job, you may have a case to at least get them to stop talking if not demand to be compensated.
If what your former employer is saying is true then you shouldn't have the right to sue. Just because you resigned doesn't give you a free ticket to work for others without them knowing what kind of an employee you are. On the other hand if your former employer is slandering you with lies and false accusations then sue the crap out of him.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.