Famous Conspiracy Theories

Black Helicopters

This conspiracy theory emerged in the United States during the 1960s. The John Birch Society was among its earliest promoters, asserting that a United Nations force would arrive in unmarked black helicopters to subjugate American citizens under UN authority. A parallel theory concerning "phantom helicopters" surfaced in the United Kingdom during the 1970s.

The theory re-emerged with renewed force during the presidency of Bill Clinton in the 1990s, energetically promoted by writer Jim Keith in his book Black Helicopters Over America. By the 2000s, the phrase "black helicopters" had become a shorthand for anti-government conspiracy theories that strain credibility — commonly associated with militia groups and amplified by certain media figures. The term now broadly denotes unfounded suspicions of secret government overreach.

New World Order

One of the most pervasive and enduring political conspiracy theories, the New World Order posits that a secretive elite — variously identified as governments, banks, corporations, or shadow organisations — is actively working to establish a single authoritarian world government. Variants incorporate the Illuminati, Freemasonry, international banking families, and various geopolitical bodies as supposed architects of this plan.

John F. Kennedy — 1963

The assassination of President John F. Kennedy on 22 November 1963 in Dallas, Texas has generated more conspiracy literature than perhaps any other event in modern history. Lawyer and author Vincent Bugliosi estimated that over 1,000 books had been written on the subject, with at least ninety percent arguing in favour of a conspiracy rather than the lone-gunman conclusion of the Warren Commission.

The range of accused parties is extraordinary: the CIA, the Soviet KGB, the Italian-American Mafia, sitting Vice President Lyndon B. Johnson, Cuban Prime Minister Fidel Castro, and Cuban exile groups have all been implicated — sometimes simultaneously. A persistent strand of the theory holds that the United States federal government deliberately suppressed crucial evidence in the assassination's aftermath to shield the true perpetrators.

Harold Holt — Australian PM, 1967

On 17 December 1967, Australian Prime Minister Harold Holt vanished while swimming at Cheviot Beach near Portsea, Victoria. Although drowning is the broadly accepted explanation, his body was never recovered, leaving the case open to speculation and making it one of the most discussed unsolved mysteries in Australian history.

One of the more dramatic theories — first popularised in British writer Anthony Grey's 1983 novel The Prime Minister Was a Spy — alleged that Holt had been a Chinese intelligence asset since his student days at the University of Melbourne in 1929, and that he faked his drowning to be retrieved by two Chinese frogmen and transported by submarine to China. A second strand of theories implicates the CIA or North Vietnam in a deliberate assassination. Holt's family and biographers have consistently and forcefully dismissed all such claims as groundless.

Martin Luther King Jr.

The 1968 assassination of civil rights leader Martin Luther King Jr. has attracted persistent alternative theories despite James Earl Ray's conviction. Theories variously implicate US government agencies, organised crime, and covert operations, with Ray himself later recanting his guilty plea. A 1999 civil trial brought by the King family found in favour of a conspiracy, though its evidential basis was disputed by legal scholars and the Department of Justice.

MH370 — The Disappearance

The March 2014 disappearance of Malaysia Airlines Flight 370 over Southeast Asia produced a remarkable density of competing theories. Historian Norman Davies promoted the idea that hackers remotely seized control of a Boeing Uninterruptible Autopilot supposedly installed on board, piloting the aircraft to Antarctica. American theorist James H. Fetzer attributed the disappearance to then-Israeli Prime Minister Benjamin Netanyahu. One widely circulated theory claimed the aircraft was secretly kept in storage, then redeployed as MH17 — the flight shot down over Ukraine four months later — as part of a geopolitical frame-up.

Korean Air Lines Flight 007

The Soviet destruction of KAL Flight 007 in 1983 attracted theories ranging from the plane being on a deliberate US espionage mission to stranger claims involving the fate of passengers' remains. The event is frequently cited as an example of how geopolitically charged incidents spawn elaborate alternative narratives even when documentary evidence is relatively clear.

Chemtrails / SLAP

The chemtrail theory — formally termed the Secret Large-scale Atmospheric Program — holds that the white condensation trails left by high-altitude aircraft are in fact chemical or biological agents deliberately dispersed under secret government policy. Proponents allege the trails contain a toxic mixture of aluminium, strontium, and barium.

In 2016, the Carnegie Institution for Science published the first peer-reviewed scientific study specifically addressing the chemtrail claim. Of 77 participating atmospheric chemists and geochemists, 76 stated they had found no evidence supporting the theory, with several noting that proponents rely on poor sampling methodology. Despite this, surveys suggest approximately 17% of the global population considers the theory at least partly credible.

The Phantom Time Hypothesis

Proposed by German theorist Heribert Illig in 1991, the Phantom Time Hypothesis alleges that approximately 297 years of history — roughly AD 614 to 911 — were fabricated and inserted into the historical record by establishment figures including Holy Roman Emperor Otto III and Pope Sylvester II. The motive, according to Illig, was to position these rulers at the turn of the first millennium for reasons of prestige and religious significance. Mainstream historians and chronologists have comprehensively rejected the hypothesis on multiple technical grounds.

Tartaria & The Mud Flood

A sprawling and internally elaborate theory, the Tartaria hypothesis claims that an advanced global civilisation — called Tartaria — existed until the 19th century, possessing free energy technology and a partially giant population. According to adherents, this civilisation was obliterated by a catastrophic "mud flood" event, with its ruins deliberately buried and evidence of its existence systematically erased by subsequent world governments. The theory draws heavily on selective misreadings of historical maps and architectural anomalies, and has gained significant traction on social media platforms.

New Chronology (Fomenko)

Developed by Russian mathematician Anatoly Fomenko, New Chronology posits that accepted historical timelines are artificially extended by many centuries, that vast swaths of historical documentation have been fabricated, and that legitimate sources have been deliberately destroyed — all for political ends. The theory attracted attention partly due to its endorsement by chess grandmaster Garry Kasparov. Academic historians universally regard it as pseudohistory with no credible evidential foundation.

The New Coke Plot — Coca-Cola, 1985

When Coca-Cola replaced its original formula with New Coke in 1985 — to widespread public outrage — many consumers concluded the change was a deliberate corporate manoeuvre. The prevailing theory held that the company intentionally introduced an inferior product either to dramatically revive demand for the original formula, or to quietly reintroduce it with a reformulated recipe using cheaper ingredients while benefiting from the nostalgic goodwill.

Deepwater Horizon — 2010

The catastrophic explosion and oil spill at the Deepwater Horizon rig in the Gulf of Mexico generated a cluster of sabotage theories. One prominent strand alleged deliberate destruction by environmental activists seeking to discredit the fossil fuel industry. Another proposed that the rig was struck by a North Korean or Russian submarine. Several of these theories were amplified by US radio host Rush Limbaugh. Investigations attributed the disaster to a sequence of corporate and regulatory failures rather than any external act.

Even figures from antiquity have attracted conspiratorial reinterpretation. Theories surrounding the death of the Roman Emperor Nero — who died by suicide in AD 68 — circulated widely in the ancient world itself. Many claimed he had faked his death, fled east, and was secretly plotting his return to power. Some early Christian communities feared he would return from the dead to resume his persecutions of Christians. Scholars have noted that the Book of Revelation may allude to these theories in its description of a "slaughtered head" restored to life.

Other frequently theorised historical deaths include those of Abraham Lincoln, Mustafa Kemal Atatürk, and numerous medieval monarchs, where verified conspiracies shade into elaborated mythologies about secret survivors, hidden heirs, or supernatural interventions.

— END OF ARTICLE — Last updated: May 2026 · Source material: Wikipedia / List of Conspiracy Theories