Add to these advice:
Advice of an experienced eicker 1:
At the interview, always answer the truth to the question "why did you leave your previous job?" Because the reputation is false or silence plays against you.

Advice of an experienced eicker 2:
At an interview, never answer the truth to the question “why did you leave your previous job?” because the reputation of a whistleblower who simply tells the secrets of the boss (even the former), plays against you.

Another one is no worse:
In the interview to the question "why left the previous place of work?" answer "I will only speak in the presence of my lawyer";