Browse Conspiracy Theories

The documented large-scale pharmaceutical cover-up of opioid addiction risk by Purdue Pharma (OxyContin), Insys (Subsys), Mallinckrodt, and related firms — contributing to over 700,000 US opioid-related deaths since 1999.

Claims that Tokyo Electric Power Company (TEPCO) and the Japanese government systematically understated radioactive contamination from the March 2011 Fukushima Daiichi nuclear disaster.

Wirecard AG, a German fintech (payments processing) once valued at €24B, collapsed in June 2020 after admitting that €1.9B in reported assets "probably did not exist." Multi-year accounting fraud involving forged trust accounts in the Philippines and Singapore.

The ancient Library of Alexandria — among history's most famous libraries — has been claimed to have been destroyed variously by Julius Caesar (48 BC), Theophilus of Alexandria (391 AD), Amr ibn al-As during Arab conquest (642 AD), or to have declined gradually. Each attribution carries cultural and political weight.

The biblical Ark of the Covenant — a gold-covered wooden chest described in Exodus containing the Ten Commandments — has been claimed to be located variously in Ethiopia (Axum), the Vatican, beneath the Temple Mount, or hidden by the Knights Templar.

On March 13, 1997, thousands of Arizonans witnessed lights moving in formation over Phoenix, Nevada, and northern Mexico. Claims include alien craft, experimental aircraft, and (the USAF's partial explanation) military flares dropped during training.

The claim that the Knights Templar — officially dissolved in 1312 by Pope Clement V after the arrests of October 13, 1307 — secretly survived through successor organizations including the Freemasons, the Priory of Sion, and modern Templar orders.

The 2008 financial crisis response — the $700B TARP, $182B AIG bailout, and Federal Reserve emergency lending — is subject to confirmed and contested claims: bank executives knew of subprime risk and profited anyway; "too big to fail" was institutionalized; regulatory capture was documented.

The April 2016 leak of 11.5 million documents from Panamanian law firm Mossack Fonseca revealed an international network of offshore shell companies used by politicians, celebrities, and criminals for tax evasion, money laundering, and concealing ownership.

The December 26-28, 1980 incidents near RAF Woodbridge (a US-operated base in Suffolk, England) when USAF personnel reported unusual lights and an "illuminated triangular craft" in the adjacent Rendlesham Forest.

The claim, promoted by Soviet KGB disinformation Operation Denver/INFEKTION (1983-1987) and subsequent circulation, that HIV/AIDS was created by the US CIA or US Army Fort Detrick biological weapons program.

The 1950s-60s marketing of thalidomide (sedative, anti-nausea for pregnant women) by Chemie Grünenthal (Germany), Distillers (UK), and Richardson-Merrell (US) despite internal knowledge of risks, resulting in ~10,000 birth defects worldwide and a major documented corporate cover-up.

The Milwaukee Police Department's May 27, 1991 return of 14-year-old Konerak Sinthasomphone (fleeing from Jeffrey Dahmer's apartment) back to Dahmer, despite bystander objections. The victim was killed that night. This incident and broader investigative failures are well-documented; claims of intentional protection remain contested.

The documented failure and subsequent cover-up of the police response to the May 24, 2022 mass shooting at Robb Elementary School in Uvalde, Texas, where 19 children and 2 teachers were killed. Officers waited in the hallway for 77 minutes while the shooter remained in a classroom with surviving children and their mothers pleading outside.

The July 17, 2014 destruction of Malaysia Airlines flight 17 (Boeing 777) over eastern Ukraine, killing 298 people. The Dutch Safety Board investigation and Joint Investigation Team (JIT) concluded the aircraft was shot down by a Russian-owned Buk surface-to-air missile system from a field in Russian-separatist-controlled Donbas.

Condensation trails (contrails) are the normal ice crystal trails formed behind aircraft at high altitude when hot, humid engine exhaust meets cold air. Distinct from the "chemtrail" conspiracy theory, which claims these trails contain deliberate chemical spraying programs.

The October 1, 2017 mass shooting at the Route 91 Harvest country music festival in Las Vegas, which killed 60 and wounded over 400 — the deadliest mass shooting in modern US history. Various conspiracy theories claim multiple shooters, ISIS involvement, MGM/security cover-up, or government-directed false-flag operations.

The April 20, 2010 Deepwater Horizon oil rig explosion in the Gulf of Mexico killed 11 workers and released ~4.9M barrels of oil — the largest marine oil spill in history. BP, Transocean, and Halliburton's cost-cutting and safety failures are documented; allegations of regulatory capture and concealment of spill volume are partly supported.

The Bush administration's 2002-2003 claim that Saddam Hussein's Iraq had operational ties to al-Qaeda, used as a central justification for the 2003 US invasion. The 9/11 Commission, Senate Intelligence Committee reports, and a 2006 Pentagon IG report all concluded no such operational relationship existed.

The false claim that the April 15, 2013 Boston Marathon bombing was staged by the US government or involved "crisis actors" rather than being conducted by the Tsarnaev brothers. The real bombing killed 3 people and injured 260+.

The July 16, 1999 crash of a small aircraft off Martha's Vineyard piloted by John F. Kennedy Jr., killing him, his wife Carolyn Bessette, and sister-in-law Lauren Bessette. Conspiracy claims allege assassination by the Clintons, a senior Kennedy family cabal, or staged disappearance — the latter a QAnon staple.

The July 20, 1993 death of Deputy White House Counsel Vincent Foster in Fort Marcy Park, Virginia, officially ruled suicide by five separate investigations. Conspiracy claims allege murder by the Clintons or a cover-up of connections to Whitewater or Hillary Clinton.

The long-documented relationship between Panamanian dictator Manuel Noriega and the US Central Intelligence Agency, including his role as a paid CIA asset (1967-1988) while simultaneously trafficking cocaine, running intelligence operations, and aiding US anti-communist operations in Latin America.

The 1943 FBI seizure of Nikola Tesla's papers and belongings from his New York hotel room within hours of his death. The seizure is well-documented; what was taken, what was sensitive, and whether technology was subsequently suppressed remains partly contested.