History of Bihar- Lalu Prasad Yadav used to call Jan Nayak ‘Kapti Thakur’, projects Kaproori Thakur as ‘Guru’ after Bharat Ratna
Sankarshan Thakur clearly mentions this in his book 'The Brothers Bihari,'that Lalu Yadav used to call Karpoori Thakur 'Kapti Thakur'