From Fox News:

Cheryl Mills, Clinton’s former chief of staff, along with two other State Department staffers, John Bentel and Heather Samuelson, were afforded immunity agreements, as was Bryan Pagliano, Clinton’s former IT aide, and Paul Combetta, an employee at Platte River networks, the firm hired to manage her server after she left the State Department.

As Fox News has reported, Combetta utilized the computer program “Bleachbit” to destroy Clinton’s records, despite an order from Congress to preserve them, and Samuelson also destroyed Clinton’s emails. Pagliano established the system that illegally transferred classified and top secret information to Clinton’s private server. Mills disclosed classified information to the Clinton’s family foundation in the process, breaking federal laws.

None should have been granted immunity if no charges were being brought, the source said.