The Search For Deep Throat

In July 2005, the identity of one of the most famous informants in American political history was revealed. Deep Throat leaked details of President Nixon's Watergate cover-up to the Washington Post leading eventually to the president's resignation. He was former assistant director at the FBI, Mark Felt. Louise Hidalgo has been talking to the lawyer who helped persuade the elderly Mark Felt to go public after 30 years of silence and speculation.

Picture: Bob Woodward (left) and Carl Bernstein, the Washington Post reporters who broke the Watergate story, at their desk, 29th April 1973. They nicknamed their anonymous source Deep Throat. (Credit: Getty Images)