Russia, we are told, breached the servers of the Democratic National Committee (DNC), swiped emails and other documents, and released them to the public, to alter the outcome of the U.S. presidential election.

How substantial is the evidence backing these assertions?

Hired by the Democratic National Committee to investigate unusual network activity, the security firm Crowdstrike discovered two separate intrusions on DNC servers. Crowdstrike named the two intruders Cozy Bear and Fancy Bear, in an allusion to what it felt were Russian sources. According to Crowdstrike, “Their tradecraft is superb, operational security second to none,” and “both groups were constantly going back into the environment” to change code and methods and switch command and control channels.

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