Roger Stone, President Trump's longtime friend and adviser, is implicated in the F.B.I.’s investigation into Russia. But, who is he? For starters, he's a self-proclaimed "dirty trickster" who predicted that Hillary Clinton's campaign manager would be hacked. Subscribe to HuffPost today: http://goo.gl/xW6HG Get More HuffPost Read: http://www.huffingtonpost.com/ Like: / huffingtonpost Follow: / huffingtonpost