The case filed by the CBI against former Union minister Dayanidhi Maran explains in detail how Mr Maran allegedly misused his office when he was Telecom Minister to ensure mobile operator Aircel was sold to an entrepreneur who returned the favour with Rs. 549-crore kickback. The FIR or First Information Report filed by the CBI, explains how. "An illegal gratification of Rs. 549 crore was accepted as quid pro quo through his (Maran's) brother, Kalanithi, in the garb of share premium invested in Sun TV."