There are numerous stories suggesting links between Trump and the mob, see references below.
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(1) David Marcus, "How Close Was Donald Trump to the Mob," The Federalist, July 28, 2015, http://thefederalist.com/2015/07/28/how-close-was-donald-trump-to-the-mob/
(2) David Clay Johnston, "21 Questions for Donald Trump," The National Memo, July 10, 2015, http://www.nationalmemo.com/21-questions-for-donald-trump/
(3) Associated Press, "Donald Trump's senior advisor is a stock fraud felon with mob past," New York Post, December 5, 2015, http://nypost.com/2015/12/05/donald-trumps-senior-adviser-is-a-stock-fraud-felon-with-mob-past/ (Felix Sater)
(4) Matthew Mosk, and Brian Ross, "Memory Lapse? Trump Seeks Distance From 'Advisor' with Past Ties to Mafia," ABC News, December 10, 2015, http://abcnews.go.com/Politics/memory-lapse-trump-seeks-distance-advisor-past-ties/story?id=34600826