The credit crunch has excised its pound of flesh from the world's billionaires. Here are five who were hit with margin calls:rn1. Aubrey McClendon of Oklahoma City sold most of his shares in Chesapeake Energy for about $620 million; those shares were worth $2.3 billion in July.rn2. Sumner Redstone, Beverly Hills media tycoon, sold $230 million worth of shares in Viacom and CBS; those shares were worth $420 million in early October.rn3. Oleg Deripaska, Russian aluminum magnate, sold $1.5 billion of holdings in Canadian auto parts maker Magna International and Hochtief, a German construction company; those holdings were worth $2.1 billion in February.
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