U13 entries

• U-2 IncidentMay 1, 1960 shooting down of American U-2 spy plane over Soviet territory, resulting in pilot Francis Gary Powers' capture and derailing the Paris Summit between Eisenhower and Khrushchev.
• UAP Disclosure Act2023 legislative effort led by Senators Chuck Schumer and Mike Rounds to mandate federal review and declassification of government records related to unidentified aerial phenomena, ultimately enacted in modified form.
• UFO/AI/New World Order Integration TheoryA syncretic contemporary conspiracy theory linking extraterrestrial phenomena, artificial intelligence development, and plans for global governance, arguing that these represent connected elements of a coordinated agenda toward transformed human civilization.
• Underground Government Bunkers ConspiracyUnderground government bunkers conspiracy theory alleges that American government and military maintain vast network of Deep Underground Military Bases (DUMBs) designed to preserve government continuity, house surveillance infrastructure, and facilitate covert operations independent from public oversight.
• Unification ChurchNew religious movement founded by Sun Myung Moon in 1954, known for mass wedding ceremonies, aggressive recruitment practices, and extensive business enterprises that generated cult allegations and government investigations.
• Unit 731Covert Imperial Japanese Army biological warfare research unit that conducted lethal human experimentation on thousands of prisoners in occupied Manchuria during World War II, whose personnel were granted immunity from prosecution in exchange for research data.
• USA PATRIOT ActThe USA PATRIOT Act is real federal legislation passed weeks after the September 11, 2001, attacks that broadly expanded law enforcement and intelligence surveillance powers, including wiretapping, financial monitoring, and records searches, provisions whose passage is a matter of public record even as their long-term effects on civil liberties remain a subject of ongoing dispute.
• USAID HIP-HOP FUNDING THEORYConspiracy theory that United States agencies financed hip-hop to shape political opinion, based partly on a documented USAID operation involving Cuban rappers but extended without evidence to mainstream American music.
• USS Liberty IncidentJune 8, 1967 attack by Israeli forces on U.S. Navy intelligence ship USS Liberty during the Six-Day War, killing 34 American servicemen and wounding 171 in an incident both governments maintain was mistaken identity.
• USS Nimitz Tic Tac IncidentNovember 2004 encounter in which U.S. Navy pilots observed and tracked an unidentified aerial phenomenon exhibiting extraordinary flight characteristics, later confirmed by the Pentagon through official video release.
• Ustica MassacreJune 27, 1980 destruction of Itavia Flight 870 over the Mediterranean Sea, killing all 81 aboard in an incident Italian courts attributed to military action despite decades of official cover-up attempts.
• Utah Data CenterMassive National Security Agency data storage facility completed in 2013 near Bluffdale, Utah, capable of processing and storing vast quantities of digital intelligence gathered through surveillance programs.
• Utah WarArmed confrontation between the U.S. federal government and Mormon-controlled Utah Territory from 1857-1858, triggered by reports of Mormon defiance but resolved without major battle through negotiated settlement.