Death by Leaks: Russian Hacking Helped Sink Clinton 2016 Campaign
In September 2015 an FBI cybersecurity agent called up the Democratic National Committee, just gearing up for the coming presidential election, to report that Russia-linked hackers had penetrated their network.
The agent was passed on to the help desk, where his message died.
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Story added 16. July 2018, content source with full text you can find at link above.