Police arrested suspended Trinamool Congress leader Kunal Ghosh on Saturday in connection with the multi-crore Saradha Group ponzy scam.The development came just few minutes after Left Front chairman Biman Bose demanded a CBI probe into the chit fund scam and claimed that several names other than that of its chairman Sudipta Sen had cropped up in connection with it.br Now the Left parties mount pressure on Mamata Banerjee and demand CBI Probe.