One correspondent of mine on the web who actually attended the 1979 interview wrote this to me once:
For starters, I was in the audience at the ICA 30 years ago when it was explained that Markstein was introduced to McGoohan by Lewis Greifer. Greifer stated that "[George Markstein and I] were discussing The Prisoner long before it started. George had worked on the Stars and Stripes and had discovered the existence of these camps where they kept people they didn't want wandering around".
This was the Big Idea the cult craved. This gave them ownership of their show and they have successfully sold their version of history to the world since. Their most recent version of the story has been published recently, all tangled up in the life-story of their Number Six, who they now find inextricable from a real person and varied actor and performer named Patrick McGoohan.
Longer-serving readers of my Blog will know I've been banging on about some of this factual evidence before. But for anyone new reading me…. Be seeing it: