The West Bengal Youth Congress on Monday held a massive protest in Kolkata demanding a probe by the Central Bureau of Investigation (CBI) into the recently exposed chit fund scam.<br /><br />The protesters also demanded immediate arrest of Trinamool Congress MP Kunal Ghosh, whose name figured in a letter by key accused in the case -- Saradha Group chairman-cum-managing director Sudipta Sen -- to the CBI. Sen had accused Ghosh of blackmailing and named him one of the many political beneficiaries of the Ponzi scheme.