Radia tapes tampered: Centre tells Supreme Court

In February 2011, the government had submitted to the apex court a copy of a complaint on basis of which it had began tapping Radia's telephonic conversations with several people including politicians, corporate leaders and media persons.

The complaint was given to the court in compliance with its December 13, 2010 order, passed on Tata's plea for a probe into the leakage of tapes containing his private conversation with Radia and for stopping further publication of its contents.

The government had told the court that it had begun tapping Radia's telephone on a complaint alleging that she was indulging in anti-national activities and was acting as spy of foreign intelligence agencies.

It had maintained that conversations were recorded as part of the surveillance ordered by the directorate general of income tax (investigation) following a complaint received by the finance minister on November 16, 2007 alleging that Radia had within a short span of nine years built up a business empire worth Rs 300 crore.

The government had given details of as to how 180 days of Radia's conversations were recorded -- first from August 20, 2008 onwards for 60 days and then from October 19 for another 60 days. Later on May 11, 2009, her phone was put on surveillance for yet another 60 days, following a fresh order given on May 8.

In wake of unearthing of the 2G spectrum allocation scam, allegedly involving a loss of Rs 1.76 lakh crore to the public exchequer, some journals had published Radia's taped conversations with politicians, journalists and industrialists. Transcripts of some of these tapes had also come up on various websites, stirring a controversy over the alleged nexus between lobbyists and journalists.