Kolkata: Amit Mitra, principal chief adviser to CM Mamata Banerjee, on Wednesday said GST in its current form had lost the purpose for which it was rolled out."At the Bengal Business Conclave, Mamata Banerjee expressed her anguish over the current mess in GST and rightly said that I advised her to support GST. Why did I? In 2009, I brought to her attention that small and medium enterprises (MSMEs)...