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https://en.wikipedia.org/wiki/Russian_interference_in_the_2016_United_States_elections
The Russian government interfered in the 2016 U.S. presidential election with the goal of harming the campaign of Hillary Clinton, boosting the candidacy of Donald Trump, and increasing political discord in the United States. Russia's covert activities were first reported by the United States Intelligence Community in October 2016, and confirmed by the Director of National Intelligence office three months later. Former FBI director Robert Mueller has been leading a Special Counsel investigation into the interference since May 2017.
Russian interference proceeded along two main vectors. First, the Internet Research Agency "troll farm", based in Saint Petersburg, created hundreds of social media accounts impersonating Americans supporting radical groups, planning and promoting rallies, and reaching millions of social media users between 2013 and 2017. According to criminal indictments by the Special Counsel, those messages and activities "spread distrust towards the candidates and the political system in general", for example by discouraging African Americans from voting or by motivating conservative voters wary of Trump.
Second, hackers affiliated with the Russian military intelligence service (GRU) penetrated computer systems of the Democratic National Committee (DNC), the Democratic Congressional Campaign Committee (DCCC), and Clinton campaign officials, notably chairman John Podesta. Tens of thousands of private emails and attachments were released to the public during the final months of the campaign, via DCLeaks, Guccifer 2.0 and Wikileaks. The exposed information revealed internal bias against Clinton's primary challenger Bernie Sanders, which led to the resignation of the DNC chair and lukewarm backing of Clinton by Sanders supporters. Russian government officials have repeatedly denied involvement in any DNC hacks or leaks. In addition to these two operations, Russia-connected individuals reached out to various Trump campaign associates, offering damaging information on Clinton or business opportunities.
The Russian interference activities triggered strong statements from American intelligence agencies, a direct warning by then-U.S. president Barack Obama to Russian president Vladimir Putin, renewed sanctions against Russia, closures of Russian diplomatic facilities and expulsion of their staff. The Senate and House Intelligence Committees have held several hearings.
The FBI and Special Counsel conducted investigations resulting in indictments of twenty-six Russian agents and three Russian organizations. The Special Counsel also has been investigating links between Russia and Trump associates, which has resulted in indictments of Rick Gates and Roger Stone, and convictions of Paul Manafort (chairman of Trump's election campaign), Michael Flynn (senior adviser to Trump), George Papadopoulos (Trump campaign's foreign policy adviser), Alex van der Zwaan, W. Samuel Patten (who laundered Russian money through the Trump inauguration committee), and Michael Cohen (Donald Trump's personal lawyer). Trump has called the interference a "hoax", contending it was an excuse by Democrats for losing the election. He dismissed FBI Director James Comey over the issue.