 From ABC News, Wall Street now. After days of surfing record high waves, the S&P 500 this morning was down 0.8%. The Nasdaq had given up 1.7%. The Dow, though, was up 100 points going into the midday. A year-long crackdown on delinquent high-income taxpayers has yielded a billion dollars for the U.S. Treasury. The IRS targeted 1,600 taxpayers with more than a million dollars of income who owed over $250,000 in tax debt.