Ted Gunderson has promoted several conspiracy theories that are supported primarily by his reputation as a high ranking FBI officer and by his claim to be a CIA agent involved in the Iran-Contra affair.
Gunderson alleges the existence of "a loose-knit network operating in this country involving drugs, pedophilia, pornography, prostitution, corruption, et cetera, et cetera." 
Gunderson's history with the FBI includes: 
Gunderson joined the Federal Bureau of Investigation in December 1951 under J. Edgar Hoover.
He served in the Mobile, Knoxville, New York City, and Albuquerque offices. He held posts as an Assistant Special Agent-in-Charge in New Haven and Philadelphia. In 1973 he became the head of the Memphis FBI office and then the head of the Dallas FBI office in 1975. Ted Gunderson was appointed the head of the Los Angeles FBI in 1977. In 1979 he was one of a handful interviewed for the job of FBI director, which ultimately went to William H. Webster.
- Joined FBI in December 1951 under J. Edgar Hoover
- Served in the Mobile, Knoxville, New York City and Albuquerque offices.
- Head of Memphis FBI office (1973 - 1975)
- Head of Dallas FBI office (1975 - 1977)
- Head of Los Angeles FBI office (1977 - 1997)
While in Dallas, Gunderson befriended Clint Murchison, Jr.
In 1986, Gunderson met with Ralph Olberg of Management Science For Health, Tim Osman, and Michael Riconosciuto "to discuss Olberg’s role with the worldwide support network involving the Mujahideen." 
Olberg accused the Soviets of using a weapon nicknamed "Blue Death" which left bodies that did not decompose after six months.
The discussion involved using the Afghan mujahideen to field-test newly developed weapons. Riconosciuto offered to modify Chinese Norinco 107mm rockets into "a backpack portable effective artillery counter battlery system."
Support for William Carr
Gunderson promoted William Guy Carr's book Pawns in the Game which alleged that all major social movements and both world wars were controlled by Satanic Masonic-Illuminati bankers as a plot against Christianity. 
Support for Jeffrey MacDonald
Gunderson was hired by Jeffrey R. MacDonald as a private investigator to work on MacDonald's defense against charges of killing his wife and children. Gunderson claimed to have "established beyond any question of a doubt that this man is absolutely innocent" and to have obtained a confession from Helena Stoeckley that the murders of MacDonald's wife and children were part of her initiation into a Satantic cult.
One of the questions I asked her... "describe the jewelry box on the dresser in the master bedroom," and she described it right to a 'T' ... Also, she told me that she attempted to ride a rocking horse in the child's bedroom that night but she couldn't ride it because the spring was broken. The only way she could have known that spring was broken was to have been there...
Gunderson claims that the FBI had tried to pressure his witnesses into retracting their statements.
My nineteen new witnesses, including Helena Stoeckley, started calling me and saying "Hey Ted, the FBI has interviewed me, they are trying to get me to recant." And I'm saying to myself, that isn't the responsibility of the FBI. The FBI is supposed to gather information, not destroy it. And that was my first clue that we had a serious problem in that case.
And I continued on, and I had a number of other cases that I handled privately, and in each instance I noticed that evidence was lost, destroyed, stolen. I noticed that there were strong indications of corruption. So I asked myself, what's going on here?
Allegations on the Finders
Gunderson alleges that The Finders are a "covert operation involving the international trafficking of children" under CIA cover. Gunderson cited a Customs report calling the investigation of the Finders a "CIA internal matter". 
Gunderson gave Senator Arlen Specter "a list of sixteen names of people who had personal, direct knowledge of drugs being brought into this country by the CIA. I never heard another word. None of those people appeared as witnesses." 
Gunderson claims to have found a Satanic site in Crestline, California that had burned down the day after the allegations of child abuse at McMartin preschool were first published. Symbols found at the site match the appearance of the seals of Asmoday and Belial from Aleister Crowley's book Goetia: The Lesser Key of Solomon the King. Gunderson implied that some of the children had been flown to this site for abuse and then flown back to the preschool the same day to be picked up by their parents. 
Oklahoma City Bombing
Allegations of Satanism
Gunderson claims: 
There are in my estimation over three million practicing Satanists in America today. Now how did I come up with those figures? I have informants. I have an informant in south-central LA, population of 200,000, who told me there were 3,000 practicing Satanists in that area.... I have an informant in Lincoln, Nebraska, who told me 3,000 practicing Satanists. Lincold, Nebraska, a town of 200,000... Iowa City, Iowa, a town of 150,000, excuse me, 100,000, 1500 informants.
Gunderson claims that "Fifty to sixty thousand individuals are sacrificed every year" and that about 1.5% of the American population are practicing Satanists.
Gunderson claims that the Satanic movement "has set up preschools throughout the world for the purpose of getting their hands on our children... in many of these preschools the children are exposed to sex from the time of birth."
Gunderson was a supporter of Linda Weigand who accused her ex-husband Tom Wilkinson of molesting her children.
- Stew Webb
MacDonald case links:
- Ted Gunderson - CIA & Satanism, http://www.youtube.com/watch?v=3EBowBPwNW4
- Carol Marshall, The Last Circle, Chapter 6, http://web.archive.org/web/20100419054747/http://wiretap.stumblers.net/2010/04/the-last-circle/6/