Is this suing thing also applies on ex-employer, like Project Manager, Director or any similar Authoritative personnel?

Yes, I am serious. Before coming to LA, my employer (or ex-employer) employed every trick to harass me. They even didn't give me 3 months salary! Had I got the chance, I would have sued them.

But now if, in future, I need to specify their name for reference or background check, and in case they put me/my name/my work in wrong note, can I sue them?