U.S. intelligence agencies and special counsel Robert Mueller's investigation concluded that Russia conducted a sophisticated cyber campaign to interfere with the 2016 presidential election to help elect Republican nominee Donald Trump and hurt Democratic candidate Hillary Clinton. This effort consisted of a disinformation campaign on social media, hacks into the Democratic National Committee computer system and attempts to penetrate the voting systems of every state. The Justice Department indicted 25 Russian nationals, some of them members of the Russian intelligence agency GRU, for hacking emails and computer networks or for trying to defraud the United States.

Sources: Robert S. Mueller III, “Report on the Investigation into Russian Interference in the 2016 Presidential Election Pursuant to 28 C.F.R. 600.8(c),” U.S. Department of Justice, March 2019, https://tinyurl.com/v42ym4e; “2016 Presidential Campaign Hacking Fast Facts,” CNN, Oct. 31, 2019, https://tinyurl.com/ycqdxyhz; and David E. Sanger and Catie Edmondson, “Russia Targeted Election Systems in All 50 States, Report Finds,” The New York Times, July 25, 2019, https://tinyurl.com/y2nlsrz2

Data for the graphic are as follows:

Successful phishing attacks enabled access to Democratic campaign emails.
Emails obtained through hacks were published by WikiLeaks, damaging the Clinton campaign.
At least one employee of a U.S. voting machine company had email account compromised.
More than 3,000 ads posted on Facebook were later identified as Russian disinformation.
Some ads on Facebook were aimed at voters in the swing states of Michigan and Wisconsin.
Russian online trolls posed as Black Lives Matter activists to depress black support for Clinton.
Russians sought to penetrate voting systems in all 50 states, but investigators found no evidence votes were changed.
Hackers obtained the ability to delete or change voter data in Illinois, but did not do so.

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