This is from a book called "Supermob" by Gus Russo. One of the amazon reviews describes it as a pile of research notes rather than a coherent book, and expresses skepticism about some of the content, but adds that at least it cites and sources its factoids, so that the reader can make up his/her own mind about the validity of any given detail. That's consistent with my impression of the bits I've read. Anyway, the book is about Sidney Korshak, a lawyer with ties to the Chicago mob, the Teamsters, and the entertainment industry, and the chapter in question is a collection of circumstantial evidence tying Korshak to various attempts to get Hoffa pardoned. The paragraph of interest reads:
In Chicago, investigator Jack Clarke also picked up evidence of the Sidney connection(Clarke relates a Hoffa-centered discussion with Sidney Korshak's brother Marshall, which I'm skipping over)...Clarke also heard the story from Audie Murphy "Audie Murphy was my best friend. He told me he was asked by Sidney Korshak to go see Nixon in the White House. Senator George Murphy and Nixon had been good to Audie, and he was told to go to the White House and cop a plea for Hoffa. Korshak talked to Murphy about it in the office of Senator George Murphy, and they got Audie to go talk to Nixon.
The Jack Clarke in question seems to be this guy, now deceased: http://articles.chicagotribune.com/2008 ... estigators
I found this interesting for two reasons: one, a possible glimpse of one of his police/law enforcement contacts in the shape of Clarke, and two, it kind of supported a hunch I'd developed from reading Graham's account of the Hoffa business. I'd come away from Graham's account thinking "it just doesn't sound, in spite of the effort he was putting into it, like Audie Murphy was all that emotionally invested in the outcome. This doesn't sound like something he was doing to satisfy his own sense of justice or because he was that screamingly desperate for money. This sounds more like a favor he's grudgingly doing for a friend." So, you have this account, in which he was persuaded into it in part by George Murphy, who was a friend and due to a then-recent operation couldn't talk above a whisper, and some pieces kind of fell into place for me.
(edited to remove jokey line that came out more sarcastic than I'd intended, sorry.)