A mysterious Russian spy agency left unsettling calling cards for US targets, the Journal reported. Get the inside scoop on today’s biggest stories in business, from Wall Street to Silicon Valley — delivered daily. The Russian Department for Counterintelligence Operations, or DKRO, is a secretive organization that operates under the FSB, Russia's security agency. They know us extremely well," Dan Hoffman, a former Central Intelligence Agency station chief in Moscow, told the Journal. American officials told the Wall Street Journal the DKRO was likely behind the arrest of Gershkovich, who has now been imprisoned in Russia for more than 100 days.

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Persons: Evan Gershkovich, They've, Dan Hoffman, Gershkovich, Paul Whelan, Trevor Reed, Whelan, Reed Organizations: Service, Wall Street Journal, Russian Department for Counterintelligence Operations, Central Intelligence Agency, Wall Street, Journal, American Locations: Russian, Wall, Silicon, American, America, Moscow, Russia