The Biden administration coerced social media and technology companies into censoring user content. There was an implied threat that if the companies didn't comply then the administration would hit them in other ways. This was a violation of the
spirit of the First Amendment, although not technically illegal.
https://www.scotusblog.com/2024/06/justices-side-with-biden-...
(Yes, I am aware that other administrations have also attempted various forms of censorship so let's not waste time on whataboutism.)