The site, Distributed Denial of Secrets, was founded last month by transparency activists. Co-founder Emma Best said the Russian leaks, slated for release on Friday, will bring into one place dozens of different archives of hacked material that at best has been difficult to locate, and in some cases appears to have disappeared entirely from the web.

“Stuff from politicians, journalists, bankers, folks in oligarch and religious circles, nationalists, separatists, terrorists operating in Ukraine,” said Best, a national security journalist and transparency activist. “Hundreds of thousands of emails, Skype and Facebook messages, along with lots of docs.”

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The site’s Russia section already includes a leak from Russia’s Ministry of the Interior, portions of which detailed the deployment of Russian troops to Ukraine at a time when the Kremlin was denying a military presence there. Though some material from that leak was published in 2014, about half of it wasn’t, and Wikileaks reportedly rejected a request to host the files two years later, at a time when Julian Assange was focused on exposing Democratic party documents passed to Wikileaks by Kremlin hackers.

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The collection includes files from Alexander Budberg, a Russian columnist married to Dmitry Medvedev’s press secretary; Kirill Frolov, Vice-Director of the Kremlin-backed Institute for CIS Countries; and Vladislav Surkov, a top aide to Vladimir Putin who was hacked by CyberHunta in October 2016. The Surkov files contained documentary evidence of the Kremlin’s covert coordination with pro-Russia separatists within Ukraine, and though the Kremlin denounced the leak as a fake, several independent forensics examiners agreed the emails were the real deal.