Count Austrian investor Sonja Kohn near the top of the list for Madoff victims who have it worst. After her Bank Medici lost $2.1 billion thanks to Madoff, Kohn has now disappeared and those close to her believe it is because the Russian oligarchs whose money she lost are seeking retribution. "With Russian oligarchs as clients," said another Viennese banker, "she might have reason to be afraid." Kohn lived in New York in the 1980s, when she befriended Madoff. After returning to Vienna, she was known as "Austria's Woman on Wall Street," attracting investments from Russians, Ukrainians, and Israelis. Since Kohn's losses were exposed, Bank Medici has been taken over by Austrian regulators.