Brooklyn, NY – Retired financier Howard Rubin, once a high-flying figure in New York’s investment world, was arrested Friday morning on charges of sex trafficking and bank fraud in connection with what prosecutors describe as a multimillion-dollar interstate trafficking network centered in a Midtown penthouse outfitted as a sex “dungeon.” Federal prosecutors unsealed a 10-count indictment charging Rubin, 66, and his longtime personal assistant, Jennifer Powers, with recruiting and transporting women across state lines to engage in commercial sex acts. Rubin, who was taken into custody at his Fairfield, Connecticut home, is set to be arraigned in Brooklyn federal court.…