Howrah (WB): Chandra Kumar Bose, grand-nephew of Netaji Subhas Chandra Bose, today joined BJP, just two days after 100 secret files which could throw some light on the mystery over the INA chief's death were made public by Prime Minister Narendra Modi on his 119th birth anniversary.

Bose joined the BJP in poll-bound West Bengal in the presence of party president Amit Shah at a public rally addressed by the latter in Howrah where he targeted Mamata Banerjee government, alleging only chit fund industry is flourishing in the state and that it was turning into a safe haven for anti-national elements and fake currency racket.