Global hedge funds went on a buying spree Monday, capitalizing on a massive sell-off in U.S. equities to hunt for bargains. This activity marked the largest one-day buying frenzy in five months, according to a note from Goldman Sachs. Hedge funds snapped up individual U.S. stocks at the fastest pace since March, reversing a prolonged selling trend. Despite a sharp drop of 3% in the $S&P 500 Index (.SPX.US)$, institutional investors p...