New Delhi, Jan. 22 -- The Enforcement Directorate's (ED) chief, Rahul Navin, is likely to visit Kolkata on Thursday to review the working of its eastern region office, days after a dramatic raid at I-PAC's office by the federal agency turned into a legal battle. The federal agency carried out raids on January 8 on the political consultancy firm - I-PAC - which is also advising the Trinamool Congress (TMC), but it claimed that the action was obstructed by the chief minister Mamata Banerjee and West Bengal police, who took away the evidence including electronic devices seized by it. The Supreme Court is currently hearing the matter where ED has sought action against Banerjee, including a CBI probe into the matter.P9...