West Bengal Minister Madan Mitra was arrested on Friday in the Saradha chit fund scam, in growing trouble for the government of Mamata Banerjee. He is the first minister and third major leader of the ruling Trinamool Congress to be arrested in the scam, in which lakhs of people were cheated out of their savings. Mr Mitra is known to be one of Chief Minister Mamata Banerjee's most trusted aides and a founder member of the party.