John Earle Sullivan (born July 18, 1994), also known as Activist John, is an American political activist and self-identified photojournalist who participated in the 2021 United States Capitol attack. Before the January 6 attack, Sullivan organized and participated in protests relating to the Black Lives Matter (BLM) movement, though a few other BLM organizers explicitly disavowed him, even expelling Sullivan from rallies and warning fellow activists to avoid associating with Sullivan.