The former head of McKinsey and a trusted consigliere to chief executives around the world, he was that rare businessman whose integrity was considered beyond reproach. Yet if the Securities and Exchange Commission is to be believed, just 11 days before his daughter’s wedding celebration, Gupta had done something virtually no one who knew him could have imagined. According to the SEC, it was on the evening of June 10, 2008, that Gupta, in “a flurry” of phone conversations with Raj Rajaratnam, the founder of the Galleon Group of hedge funds, allegedly divulged Goldman Sachs’s still secret second-quarter earnings.