Prime Minister Narendra Modi alleged that the ruling Trinamool Congress had been involved in large-scale corruption and chief minister Mamata Banerjee did nothing to punish those of her leaders who were seen taking money in front of camera. "We have heard about Sarada and now it is Narada which has exposed many TMC leaders accepting bribes in front of camera and Mamata Didi is silent about this and has not taken any step against such leaders," Modi told an impressive BJP gathering at the Polo Ground here.