As Mr. Trump departed the White House on Wednesday, the Proud Boys, once among his staunchest supporters, have also started leaving his side. In dozens of conversations on social media sites like Gab and Telegram, members of the group have begun calling Mr. Trump a “shill” and “extraordinarily weak,” according to messages reviewed by The New York Times. They have also urged supporters to stop attending rallies and protests held for Mr. Trump or the Republican Party…

Last week, Nicholas Fuentes, the leader of America First, wrote in his Telegram channel that Mr. Trump’s response to the Capitol rampage was “very weak and flaccid” and added, “Not the same guy that ran in 2015.”

On Wednesday, the Proud Boys Telegram group welcomed President Biden to office. “At least the incoming administration is honest about their intentions,” the group wrote.