Now this is from Wikipedia, but the quotes are from a US Senate Intelligence Committee report. But there is plenty of evidence that what came from Russia was not limited to anything going under "free speech".

Intrusions into state election systems
A 2019 report by the Senate Intelligence Committee[14 found "an unprecedented level of activity against state election infrastructure" by Russian intelligence in 2016.[149] The activity occurred in "all 50 states" and is thought by "many officials and experts" to have been "a trial run ... to probe American defenses and identify weaknesses in the vast back-end apparatus—voter-registration operations, state and local election databases, electronic poll books and other equipment" of state election systems.[150] The report warned that the United States "remains vulnerable" in the 2020 election.[149]

Of "particular concern" to the committee report was the Russians' hacking of three companies "that provide states with the back-end systems that have increasingly replaced the thick binders of paper used to verify voters' identities and registration status."[150]