Question: When did Quigley's role conclude?
About the article "Astrology", section "Western politics and society".

Candidate passages:
Soon after its publication, "Tragedy and Hope" caught the attention of authors interested in conspiracies.
They proceeded to publicize Quigley's claims, disseminating them to a much larger audience than his original readership.
This began in 1970, when W. Cleon Skousen published "The Naked Capitalist: A Review and Commentary on Dr. Carroll Quigley's Book "Tragedy and Hope"".
The first third of this book consists of extensive excerpts from "Tragedy and Hope", interspersed with commentary by Skousen.
Skousen quotes Quigley's description of the activities of several groups: the Milner Group, a cartel of international bankers, the Communist Party, the Institute of Pacific Relations, and the Council on Foreign Relations.
According to Skousen's interpretation of Quigley's book, each of these is a facet of one large conspiracy.
The following year, G. Edward Griffin released the documentary "The Capitalist Conspiracy: An Inside View of International Banking" crediting the film: "We wish to acknowledge that this film was insipred by Cleon Skousen's book, The Naked Capitalist which we believe is one of the most important documents of the decade.
"In 1971, Gary Allen, a spokesman for the John Birch Society, published "None Dare Call It Conspiracy", which became a bestseller.
Allen cited Quigley's "Tragedy and Hope" as an authoritative source on conspiracies throughout his book.
Like Skousen, Allen understood the various conspiracies in Quigley's book to be branches of one large conspiracy, and also connected them to the Bilderbergers and to Richard Nixon.
The John Birch Society continues to cite Quigley as a primary source for their view of history.
Quigley is also cited by several other authors who assert the existence of powerful conspiracies.
Jim Marrs, whose work was used as a source by Oliver Stone in his film "JFK", cites Quigley in his book "Rule By Secrecy", which describes a conspiracy linking the Milner Group, Skull and Bones, the Trilateral Commission, the Bavarian Illuminati, the Knights Templar, and aliens who posed as the Sumerian gods thousands of years ago.
Pat Robertson's book "The New World Order" cites Quigley as an authority on a powerful conspiracy.
Conservative activist Phyllis Schlafly has asserted that Bill Clinton's political success was due to his pursuit of the "world government" agenda he learned from Quigley.G.
Edward Griffin relies heavily on Quigley for information about the role Milner's secret society plays in the Federal Reserve in his book "The Creature from Jekyll Island: A Second Look at the Federal Reserve".
Quigley was dismissive of the authors who used his writings to support theories of a world domination conspiracy.
Of W. Cleon Skousen's "The Naked Capitalist" he stated:Skousen's book is full of misrepresentations and factual errors.
He claims that I have written of a conspiracy of the super-rich who are pro-Communist and wish to take over the world and that I'm a member of this group.
But I never called it a conspiracy and don't regard it as such.
I'm not an "insider" of these rich persons, although Skousen thinks so.
I happen to know some of them and liked them, although I disagreed with some of the things they did before 1940.
On Gary Allen's "None Dare Call It Conspiracy" he said:They thought Dr. Carroll Quigley proved everything.
For example, they constantly misquote me to this effect: that Lord Milner (the dominant trustee of the Cecil Rhodes Trust and a heavy in the Round Table Group) helped finance the Bolsheviks.
I have been through the greater part of Milner's private papers and have found no evidence to support that.
Further, "None Dare Call It Conspiracy" insists that international bankers were a single bloc, were all powerful and remain so today.
I, on the contrary, stated in my book that they were much divided, often fought among themselves, had great influence but not control of political life and were sharply reduced in power about 1931-1940, when they became less influential than monopolized industry. 
One distinctive feature of Quigley's historical writings was his assertion that secret societies have played a significant role in recent world history.
His writing on this topic has made Quigley famous among many who investigate conspiracy theories.
Quigley's views are particularly notable because the majority of reputable academic historians profess skepticism about conspiracy theories. 
"Quigley's Village" was a long-running collection of Christian children's videos designed to teach children "sound Biblical values" in a fun and exciting way.
A combination of live action and puppets, it was very similar in style to Sesame Street but with a biblically-based rather than humanistic approach to communicating values.
Executive Producer Ed Carlstone first conceived of the idea of Quigley's Village when his three-year-old child told a lie.
With many episodes translated into Spanish, and a spin-off series ("The Simply Grand Quigley Band"), "Quigley's Village" has been seen by millions of children worldwide. 
Klaus' role is expanded in this novel immensely, as he decodes the maps which Captain Widdershins gave him in the "Queequeg" submarine and he also falls for Fiona Widdershins, the stepdaughter of the captain.
He goes with her and his sisters to attempt to find the sugar bowl but is unable to, and they unfortunately find the Medusoid mycelium instead.
Klaus realizes that Fiona and her brother are enemies of V.F.D.
when Fiona defects and joins Olaf, and he receives his first betrayal from someone he loves.
His sisters comfort him and he deciphers Quigley's code which directs them to Kit Snicket and Briny Beach. 
Mrs. Quagmire is the mother of Duncan, Isadora, and Quigley Quagmire, and a member of the fire-stopping side of V.F.D.
When the Quagmire mansion was burning down, Mrs. Quagmire saved Quigley's life by showing him the secret tunnel to Dr. Monty Montgomery's house, but died trying to save Duncan and Isadora.