Last month, Mueller indicted 12 Russian intelligence agents for hacking emails from the Democratic National Committee, the Democratic Congressional Campaign Committee, and Clinton’s campaign.
The indictment seems to describe Stone, though he is not named, as an American who communicated with the Russian hackers about the stolen emails. The indictment says that
“a person who was in regular contact with senior members of the presidential campaign of Donald J. Trump” exchanged messages with “Guccifer 2.0,” which prosecutors believe was a front for Russian military intelligence. Stone has acknowledged contacts with Guccifer 2.0 and WikiLeaks, which is believed to have helped disseminate emails stolen by the Russians.