If it sometimes seems that Wall Street is a small world, well, it is. For all its global reach, and for all the bitter conflict in recent months, where, for example, Lehman Brothers was left to tumble into bankruptcy while American International Group was bailed out, these are people who know each other, often well. Nowhere are the ties more evident than with U.S. Treasury Secretary Henry Paulson. Many of the CEOs of companies touched by the financial crisis have links to him. Some, such as Goldman Sachs CEO Lloyd Blankfein, have direct connections via that company, which Paulson used to head. Others connect through a network of fellow CEOs. See the graphic