Know how Shatrughan Sinha entered politics from films

Shatrughan Sinha's son Luv Sinha is contesting the Bihar Assembly elections 2020. Shatrughan Sinha himself is also active in politics. 

How did he get into politics from films? Who had made such a prediction about his political career?

How a boy with a mutilated face became a hero?
Watch this video to know unknown facts about Shatrughan's life and political career