A coalition of conservative groups is warning Big Tech companies to heed the lessons of 2020, and avoid interfering in the upcoming presidential election.

“In the 2020 election, we saw tech platforms bamboozled into performing extreme acts of censorship after a coordinated pressure campaign from government officials,” a coalition of more than 30 groups wrote to America’s 50 largest tech firms on Thursday. The coalition, led by the Media Research Center’s Free Speech Alliance, pointed in particular to tech platforms’ censorship of the Hunter Biden laptop story.

“The FBI had known of the laptop’s existence since December 2019 but met with many of your employees prior to the publication of the story to spike it. Unfortunately, several of your companies — in partnership with the Department of Homeland Security-affiliated Election Integrity Project — acquiesced to the FBI’s demands,” the letter reads.

“Twitter (now X) locked the account of the New York Post. Facebook (now Meta) blocked links to the story from being shared. Both firms aggressively suppressed the reporting from their newsfeeds and reduced the visibility of accounts that reposted it,” it continues.