Special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE in his highly-anticipated report said his team identified "dozens" of U.S. political rallies organized on social media by the Internet Research Agency (IRA), a Russian troll farm that was later indicted for attempting to interfere with the 2016 presidential election.

According to Mueller's report, which was released on Thursday, the IRA organized political rallies in the U.S. using social media starting in 2015 and continued to coordinate rallies after the 2016 election.

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Mueller wrote that some of the rallies attracted "few (if any) participants," while others drew "hundreds."

The IRA, a Russian troll farm with close ties to Russian President Vladimir Putin Vladimir Vladimirovich PutinNavalny released from hospital after suspected poisoning Ex-Trump national security adviser says US leaders 'making it easy for Putin' to meddle The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting MORE and Russian intelligence agencies, organized pro-Trump rallies, as well as gatherings opposed to Democratic presidential nominee Hillary Clinton, on U.S. soil for years, including events in New York, Florida and Pennsylvania.

The Trump campaign put a post on Facebook about one of the rallies the Russian group organized in Miami, Fla., in 2016, Mueller noted.

The troll farm used its Facebook and Twitter accounts to organize and promote U.S. political rallies, often sending direct messages to its followers on social media asking them to participate in the events, Mueller wrote.

"IRA employees frequently used ... Twitter, Facebook and Instagram to contact and recruit U.S. persons who followed the group," Mueller wrote.

The IRA targeted and recruited racial justice advocates as well as the moderators of conservative groups.

The Hill in 2017 reported that thousands of Americans attended a march organized by the troll farm in New York City. The IRA used a group called "BlackMattersUS" to coordinate the event.

The Mueller report also lays out the ways that Trump campaign officials and surrogates amplified the IRA's messages on Twitter and Facebook as they sought to interfere in public discourse and amplify divisive political rhetoric.