Last summer, cyber investigators plowing through the thousands of leaked emails from the Democratic National Committee uncovered a clue.

A user named “Феликс Эдмундович” modified one of the documents using settings in the Russian language. Translated, his name was Felix Edmundovich, a pseudonym referring to Felix Edmundovich Dzerzhinsky, the chief of the Soviet Union’s first secret-police organization, the Cheka.

It was one more link in the chain of evidence pointing to Russian President Vladimir Putin as the man ultimately behind the operation.

During the Cold War, when Soviet intelligence was headquartered in Dzerzhinsky Square in Moscow, Putin was a KGB officer assigned to the First Chief Directorate. Its responsibilities included “active measures,” a form of political warfare that included media manipulation, propaganda and disinformation. Soviet active measures, retired KGB Major General Oleg Kalugin told Army historian Thomas Boghart, aimed to discredit the United States and “conquer world public opinion.”

As the Cold War has turned into the code war, Putin recently unveiled his new, greatly enlarged spy organization: the Ministry of State Security, taking the name from Joseph Stalin’s secret service. Putin also resurrected, according to James Clapper, the U.S. director of national intelligence, some of the KGB’s old active- measures tactics.

On October 7, Clapper issued a statement: “The U.S. Intelligence community is confident that the Russian government directed the recent compromises of emails from U.S. persons and institutions, including from U.S. political organizations.” Notably, however, the FBI declined to join the chorus, according to reports by the New York Times and CNBC.

Read the rest at Reuters here.