Authorities: Russian trolls set up fake groups to organize real activists

Investigators say the St. Petersburg-based Internet Research Agency created front groups that encouraged American activists to take real-world action, such as organizing demonstrations, giving speeches and making videos.
2:23 | 10/18/17

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Transcript for Authorities: Russian trolls set up fake groups to organize real activists
Next this evening, if you thought the Russians and their involvement ended with the selection, authorities say, not to fast. This evening, a new report about Russia's efforts to stir up racial conflict, right now, inside the United States. Here's ABC's chief investigative correspondent Brian Ross. ??? Reporter: A stunning claim tonight about just who is behind the group promoted in this music video, black matters U.S. Congressional investigators say black matters U.S. Was actually set up by the Russians during the 2016 election to stir up racial tensions. It's not fair. I don't think it's fair. Reporter: The St. Louis rapper who wrote the music for the video says he got Instagram messages from people he didn't know asking him write a song dealing with police brutality. I had no clue that it was Russian or anything like that. No, sir, it messed me up. Reporter: All part of a sophisticated campaign that included Facebook ads, Twitter posts and efforts to organize at least two big rallies, once again police brutality. U.S. Investigators believe it was directed from this so-called troll factory in St. Petersburg, Russia. As a way to suppress votes and stoke fear a level of sew his case that I don't think we appreciated at the time. Reporter: Investigators say the Russian factory also was behind these YouTube videos, first reported by "The daily beast," aimed at black communities, attacking Hillary Clinton. Hillary Clinton is not our candidate. Reporter: The speakers claimed to be in Atlanta but investigators think they may actually be people hired by the Russians in Africa. And the Russians remained busy, even after the election. Another Russian group called black fist organized self-defense classes, supposedly for protection against the police. Five American fitness trainers were hired to run them. They paid me $320 for the month, four classes. Reporter: They're taking advantage of people who really care about the community? Right. It's very sneaky, it's very sneaky, it's very underhanded. And, in fact, Brian, the attorney general Jeff sessions was asked today on capitol hill if he believes the U.S. Is prepared for what the Russians continue to do. Reporter: Yes, David. He had a stark answer, probably not, he said, we're not, he said. The midterm elections are just over a year away, and there is still no national strategy to deal with the issue, David. Brian, you'll stay on it.

This transcript has been automatically generated and may not be 100% accurate.

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