Full detail of the case (including originating documents, "Election Influence Operations Playbook", "The State and Local Elections Cybersecurity Playbook", and "Election Cyber Incident Communications Coordination Guide":
https://vashiva.com/first-amendment-twitter-galvin-lawsuit/
Further links:
Overview and implications (site is spammy, but the content of the article is worthwhile): https://montanadailygazette.com/2021/05/25/exclusive-documents-show-big-tech-is-censoring-public-at-request-of-u-s-government/
Full detail of the case (including originating documents, "Election Influence Operations Playbook", "The State and Local Elections Cybersecurity Playbook", and "Election Cyber Incident Communications Coordination Guide": https://vashiva.com/first-amendment-twitter-galvin-lawsuit/