Fans of the Deep Throat/Mark Felt story will not want to miss this article in The Nation. You'll especially love this aspect of the tale…
…Felt's role as the most famous anonymous source in US history was even more complex and intrigue-loaded than the newly revised public account suggests. According to originally confidential FBI documents — some written by Felt — that were obtained by The Nation from the FBI's archives, Felt played another heretofore unknown part in the Watergate tale: He was, at heated moments during the scandal, in charge of finding the source of Woodward and Bernstein's Watergate scoops. In a twist worthy of le Carré, Deep Throat was assigned the mission of unearthing — and stopping — Deep Throat
No wonder they couldn't catch the guy.