How can I pass my background verification?

I was forced to leave my last job because I complained about hostile work environment, management decided to throw me out instead of giving me a comfortable place to work. Now I am failing in my background verifications, probably because my previous employer give bad impression about me.

I never mentioned bad experiences I had to face in my interview, as I was advised by my friends. I just tell I am looking for better opportunity. Should I tell the horrible experience I had there?

This is exhausting as I pass 3 or 4 interview stages and finally lost in background check. Any advise folks?

How can I pass my background verification?
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