PM Modi today paid tribute to the Iron Man Sardar Vallabhbhai Patel in Mann Ki Baat. PM Modi also remembered Bhagwan Birsa Munda, who gave his life for the freedom of the country and said that he is called Dharti Aba. PM Modi explained the meaning of Dharti Aba. He reminded how Birsa Munda gave his life while suffering the tortures of the British. Watch Video.