Days after the killing of Charlie Kirk in September, the Department of Justice announced a crackdown on “antifa,” or anti-fascist groups. Federal prosecutors soon brought terrorism charges against a group of activists who had been arrested during a protest outside Prairieland Detention Center in North Texas, accusing them of having ties to antifa. Attorney General Pam Bondi called antifa a “left-wing terrorist organization” the same day, and that same month, President Donald Trump tried to designate antifa a “domestic terror group,” though there is no federal legal basis for him to do so. He then issued National Security Memorandum-7, which...