A Goldman Sachs employee recently caused a sensation by resigning in an astonishing way -- he wrote a scathing op-ed about his former employer in The New York Times. Greg Smith, who spent nearly a dozen years at the Wall Street firm, said it had lost its moral compass, fostering an environment that is “as toxic and destructive as I have ever seen it.” The letter resonated with Tim Kiladze, a Globe and Mail journalist who once worked in investment banking and bond sales and trading.