Donald Trump's glittering empire of New York skyscrapers and Atlantic City casinos have long had a darker side, allegations that the mob helped build them. Trump's alleged ties to New York and Philadelphia crime families go back decades and have been recounted in a book, newspapers and government records. "The mob connections of Donald are extraordinarily extensive," New York investigative journalist Wayne Barrett told CNN in an interview. Barrett, the author of the 1992 unauthorized biography "Trump: The Deals and the Downfall," wrote that Trump's life "intertwines with the underworld."