Financial giant Goldman Sachs took a hit Wednesday after a mid-level executive published a scathing resignation letter in the New York Times decrying the firm’s “toxic” environment. In the letter, Greg Smith, a former Goldman Sachs executive director who worked in London, said bosses at the firm called their clients “muppets” and strove to maximize profits at the expense of client interests. He writes: “It makes me ill how callously people talk about ripping their clients off.”