Prosecutors cite text messages and emails he exchanged with the people about what Assange had, and one sent a photo of himself standing outside the Ecaudorian embassy in London, where Assange has stayed for years.
The men passed on much of the information after WikiLeaks began speaking publicly about stolen documents it had but before all had been released.
According to previous reporting, those people included radio host Randy Credico and Jerome Corsi. They are unnamed in the indictment and have not been charged with crimes.