New Republic had some good reporting on the depth of what DOJ found
https://newrepublic.com/post/185668/fbi-document-influencers-russian-disinformation
The Doppelganger program and its “Good Old USA Project” aimed to mimic mainstream media outlets to push pro-Russian policies through fake social media accounts. Documents show that the Kremlin specifically targeted Trump supporters, minorities, gamers, and swing-state voters by spreading far-right conspiracies and capitalizing on existing divisions in U.S. politics.
”They are afraid of losing the American way of life and the ‘American dream,’” Ilya Gambashidze, an architect of the project, wrote, outlining his scheme. “It is these sentiments that should be exploited in the course of an information campaign in/for the United States.” To do so, the Russian government would emphasize that Republicans are “victims of discrimination of people of color” and promote conspiracies that white middle-class people are being discriminated against.
The “guerrilla media” plan needed to not only plant falsehoods, but also spread them far and wide. They targeted gamers and chatroom users, who they described as the “backbone of the right-wing trends in the US segment of the Internet,” and monitored social media influencers. The Russians planned to build relationships with prolific posters who were “proponents of traditional values, who stand up for ending the war in Ukraine and peaceful relations between the US and Russia, and who are ready to get involved in the promotion of the project narratives.”