Paul Volcker was picked by U.N. Sec retary-General Kofi Annan to head an "independent" panel to investi gate the Oil-for-Food scandal ostensibly because of the former Federal Reserve chairman's international credibility. But credibility, like fame, can be fleeting — and Volcker's is fading fast. [snip] As Fox News Channel's Jonathan Hunt reported yesterday, Volcker is smack in the middle of the interlocking global corporations that appear to lie at the very heart of the scandal. Proceed slowly; it's complicated: [snip] * Volcker, along with a close friend named Paul Desmarais, Sr., sits on the advisory council of a Canadian...