The articles he wrote for Business Week exposed organized crime on Wall Street and the Salomon Brothers bond trading scandal in the 1990s . More recently he has covered the Financial crisis of 2007 â `` 2010 and the events caused by it . '' His Business Week articles exposed organized crime on Wall Street and the Salomon Brothers bond trading scandal in the 1990s , and more recently he has covered the 2008 financial crisis and its aftermath . ''