Mr. LaRouche, who built a worldwide following based on conspiracy theories, economic doom, anti-Semitism, homophobia and racism, died Feb. 12. He was 96.

His political organization, LaRouche PAC, confirmed the death but did not say where or how he died.

Mr. LaRouche drew headlines for his more outrageous claims — that England’s Queen Elizabeth II was a drug trafficker and that the International Monetary Fund created and spread the AIDS virus. He also said the CIA, the KGB and British intelligence officials were plotting to assassinate him, according to a 1985 Washington Post profile that included interviews with followers.

AD

AD

LaRouchians, as the group was known, never numbered more than 3,000, according to some estimates, but were a vocal, sometimes disturbing presence on the American political landscape. They heckled, harassed and occasionally threatened opponents.

His followers “made extraordinary inroads into American politics, surpassing the achievements of any other extremist movement in recent American history,” New York-based Dennis King wrote in his 1989 book, “Lyndon LaRouche and the New American Fascism.”

“They built a nationwide election machine that fielded thousands of candidates in Democratic primaries in the mid-1980s, frequently picking up 20 percent or more of the vote and winning dozens of nominations for public office,” he wrote.

AD

Members of his National Democratic Policy Committee ran several hundred candidates a year in state and local elections and won many local seats and Democratic Party posts in the 1980s.

AD

LaRouche candidates often ran disguised campaigns on mainstream tickets in an effort to trick people into voting for them; one of their methods was to campaign under a misleading slogan, such as “F.D.R. Democrats.”

During the 1984 presidential election, Mr. LaRouche received more than 76,000 votes, his highest count. Calling himself a conservative Democrat that year, he aligned his followers with the strong military and defense posture of the Reagan White House.

His campaigns proved financially lucrative. By raising $5,000 in 20 states, he qualified for federal matching funds that brought his organization millions of dollars over the years.

AD

His operation suffered a massive blow in 1988 after he was convicted of income tax evasion, mail fraud and a scheme that took money without permission from the credit card accounts of elderly donors. He served five years of a 15-year sentence and ran his 1992 campaign from a federal prison in Rochester, Minn.

AD

In appearance, the bow-tie-sporting Mr. LaRouche was more avuncular figure than reactionary firebrand. He was raised in a Quaker family that was also drawn to fervent anti-communism. As a young adult, Mr. LaRouche seemed to reject his upbringing and became a socialist ideologue, but his rambling and paranoid style increasingly sidelined him within that marginal faction.

In the late 1960s, he attracted well-educated Vietnam-era liberals who found enlightenment in his stream-of-consciousness blend of philosophy, economics and science and his purported belief that the working class was endangered by a conspiracy between the Soviet Union and the United States.

AD

Within a few years, his vision shifted far rightward and became ultraconservative and apocalyptic, and he presented himself as the moral savior of mankind.

AD

Mr. LaRouche denounced those he deemed a danger to his cause — a rotating list of alleged villains that included prosecutors, politicians, bankers and Zionists. LaRouche followers could be confrontational with those they viewed as dangers to society.

A LaRouchian once hissed insults at former secretary of state Henry Kissinger as he was walking through Newark International Airport. A physical altercation then ensued between Kissinger’s wife, Nancy, and the LaRouchian. Nancy Kissinger was acquitted of charges.

AD

Mr. LaRouche “leads what may well be one of the strangest political groups in American history,” the conservative Heritage Foundation wrote in a 1984 report. “LaRouche has managed to attract a small but fanatical following to his conspiratorial view of the world.”

According to King, those who did not embrace his views or who wanted to leave the group were branded as communists and traitors.

AD

Mr. LaRouche was said to exert strong control over the personal lives of his disciples. In interviews over the years, many former members likened him to a cult leader who was obsessed with their sexual desires and challenged their mental toughness.

In one memo obtained by The Post, Mr. LaRouche wrote that he was “taking your bedrooms away from you until you make the step to being effective organizers.”

AD

“Your pathetic impotence in your sexual life” is a political matter, he wrote. “I will take away from you all hope that you can flee the terrors of politics to the safety of ‘personal life.’ ”

The LaRouche movement eventually became a multimillion-dollar industry, according to King. Mr. LaRouche’s properties included publications such as Executive Intelligence Review and political front groups such as the Fusion Energy Foundation, the Schiller Institute and the National Caucus of Labor Committees.

AD

By some accounts, he attempted to mon­etize a large private intelligence network that compiled back-channel intelligence on corporations, governments, political parties, unions and activists.

AD

Lyndon Hermyle LaRouche Jr. was born in Rochester, N.H., on Sept. 8, 1922, and grew up in Lynn, Mass. His father, an executive at a shoe-manufacturing firm, also edited an anti-communist newspaper.

Bullied at school, young Lyndon was forbidden to fight back because of the family’s pacifist Quaker beliefs. He attended Northeastern University in Boston but left — according to his memoir, “The Power of Reason” — when teachers refused to indulge in his questioning of accepted truths in geometry class.

He was a conscientious objector at the outbreak of World War II and served as an Army medic in Burma, according to the 1985 Post profile.

AD

LaRouche associates have said their leader was drawn to revolutionary politics after the war, inspired by India’s independence from British rule. He joined the Socialist Workers Party, a Trotskyist group. Later, in New York City, he led socialist study groups. He supported himself, at times, by working as a management consultant.

AD

Among socialists, he attracted negative attention for discursive essays he wrote in florid, wandering prose. One piece discussed bel canto singing before touching on Plato and Aristotle, then examined the 18th-century German poet and philosopher Friedrich Schiller and ended with a commentary on the grain trade.

This ability to connect all sorts of disparate dots estranged him from many on the left who dismissed him as a crank. He split from one leftist organization after another and formed the National Caucus of Labor Committees. Initially low-key, his group reportedly became radicalized after Mr. LaRouche’s common-law wife left him in 1972 to marry one of his English followers.

AD

According to The Post, Mr. LaRouche began ordering his members to prepare for battle through karate and guerrilla training. In a plan he called “Operation Mop-up,” he rallied caucus members to infiltrate and attack Communist Party members in an effort to “ensure that the working class in the USA and Western Europe is prepared with competent leadership,” one of his newsletters reported.

According to a 2004 Post profile, the attacks involved “beatings with metal pipes, clubs and martial arts devices known as nunchuks.” Many were injured in dozens of fights in New York in 1973 and 1974, and several LaRouche followers were arrested.

In 1977, Mr. LaRouche married Helga Zepp, a German-born LaRouche organizer. Suddenly, followers were expected to learn German, read German poetry and study German philosophy. The think tank he founded, the Schiller Institute, was led by his wife. They moved from New York to Virginia’s Loudoun County by the mid-1980s.

A complete list of survivors was not immediately available.

One of Mr. LaRouche’s cellmates in Minnesota was disgraced televangelist Jim Bakker. In his autobiography, Bakker wrote that Mr. LaRouche was good-humored much of the time and impervious to the taunts of other inmates. He also was convinced their cell was bugged.

“To say that Lyndon was slightly paranoid,” Bakker wrote, “would be like saying the Titanic had a bit of a leak.”