Source:- livemint.com New Delhi/Kolkata: The Supreme Court on Tuesday upheld a Calcutta high court verdict ordering a federal investigation into a TV sting operation that showed top leaders of the Trinamool Congress (TMC) receiving cash, dealing a setback to West BengalтАЩs ruling party. тАЬWe find no infirmity in the findings of the high court,тАЭ an