The defendants, including two officers of the Russian Federal Security Service, Dmitry Dokuchaev and Igor Sushchin, were able to gain information about “millions of subscribers” at Yahoo, Google, and other webmail providers, the Justice Department said.

Dokuchaev and Sushchin paid co-conspirators Alexsey Belan and Karim Baratov to access email accounts, the Justice Department said. Acting Assistant Attorney General Mary McCord said that Belan is a “notorious” criminal hacker — one of the FBI’s most wanted — known for hacking U.S. e-commerce companies.

Bloomberg first reported news that indictments were expected to come on Wednesday.