The Slack messages offer more evidence of explicit coordination between the government and Twitter to censor conservative accounts. The second batch of Twitter Files, published by independent journalist Bari Weiss on Thursday, revealed the lead of the company’s Strategic Response Team (SRT), a group designated to run the platform’s shadowban operations, was a former federal intelligence operative. Jeff Carlton, the team’s head, was previously an analyst for the CIA and the FBI, according to his since-deleted LinkedIn page.

This week, Twitter CEO Elon Musk also revealed that the company’s deputy general counsel, who played a key role in the suppression of the Hunter Biden laptop story, was a former general counsel of the FBI.

Weeks before the 2020 election, Twitter blocked users from publishing links to blockbuster stories from the New York Post that implicated then-candidate Joe Biden in his son’s potentially criminal overseas business ventures. Emails that showed the former vice president’s direct involvement with Hunter Biden’s influence-peddling schemes came from an abandoned laptop in Delaware. Despite no evidence the computer was ever hacked, Twitter suppressed the story across the platform citing its hacked materials policy. The first batch of “Twitter Files” out last week showed that the company deliberately shut down the bombshells from the Post out of partisanship.

Jim Baker played a pivotal role in censoring the story at Twitter as the company’s deputy general counsel, telling colleagues “caution is warranted” that the content might be the consequence of a hack. Prior to joining Twitter, Baker was instrumental in the FBI’s deep-state operation to undermine President Donald Trump by peddling the Russia hoax. Musk fired him from Twitter Tuesday and announced the termination with a tweet.

“In light of concerns about Baker’s possible role in suppression of information important to the public dialogue, he was...