The report publised on Friday featured videos of police fatally shooting protesters, mass graves and footage of corpses.
The charge sheet, filed before the Magistrate Court of Dar Es Salaam on Friday, accused 76 people of committing treason.
Mrs Hassan’s swearing-in ceremony was held on Monday at the State House in Dodoma, the capital, under tight security.
The organisation condemned the refusal to allow journalists to cover the poll.
The party claimed the election was rigged and vowed not to recognise Samia Suluhu Hassan as the East African country’s president.
The countries condemned the killings and harassment which dogged the election.
Mrs Hassan has secured another five-year term.
