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.:98 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.:98 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 later dismissive of some 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.