Kolkata (West Bengal) [India], September 1 (ANI): West Bengal Minister and Trinamool Congress leader Chandrima Bhattacharya on Sunday, demanded that the Central Bureau of Investigation to build a strong case in the RG Kar rape and murder case to ensure “the rapist is hanged.” The TMC leader was holding a protest against the rape-murder case in Kolkata. She said Chief Minister Mamata Banerjee had directed the party’s Mahila Congress to stage a demonstration over the incident. Speaking to ANI, Chandrima Bhattacharya said, “On 28th August, our leader (Mamata Banerjee) had given directions to Trin…