After the assassination of American political activist and commentator Charlie Kirk in September 2025, there followed widespread disciplinary and retaliatory actions against people seen as celebrating, justifying, or trivializing Kirk's death, encouraging further political violence, denigrating Kirk, or tarnishing his legacy. These efforts were promoted and directly engaged in by the U.S. federal government, with President Donald Trump explicitly condemning "the left" for the violence in his address to the nation in its immediate aftermath, and pledging to target left-wing groups and causes, monitor political speech, revoke visas, and designate Antifa and groups that might support it as domestic terrorists in response to the attack.