One thought occurred to me that may be worth pursuing. Liberty Lobby folded several years ago, as the result of lawsuits or possible financial improprieties of its founder, Willis Carto. Liberty Lobby never made any attempt to become a grassroots organization, preferring to communicate via their newsletter and their periodical,
The Spotlight. Carto and several men associated with the organization, such as Revilo Oliver, were Birch Society alumni. Oliver's side of his dispute with Robert Welch is available through the Web site of an admirer of his. However, the positions of Carto and other "right wing deviationists" (to borrow a Marxist term) in Liberty Lobby are not known.
The records of Liberty Lobby are presumably now in the hands of the bankruptcy court. Do you know if they are a matter of public record? If they are, they would probably provide some perspective, though likely tainted with sour grapes, of the John Birch Society and its operations.
The most comprehensive website on Carto's career, back-stabbing, and money-making schemes is at:
http://homepage.mac.com/lsf/ Carto was employed by the JBS for a brief time but appears to have parted with Welch on amicable terms. I have a significant amount of Carto correspondence with his friend and business partner, Verne Kaub, wherein Carto reveals his racist and anti-Semitic beliefs, but he doesn't say much about the JBS or Welch.
I agree that whatever records Carto has accumulated during his lifetime would be a huge contribution to understanding the history of the modern conservative movement since Carto was intimately involved with so many of the movers and shakers in the post-World-War II conservative movement. His earliest publication "Right" (Liberty and Property, Inc.) is still an extremely valuable information source.
In the future, I will be posting a lot of material about Carto in my Yahoo group which is at:
http://groups.yahoo.com/group/FBIvsExtremeRight/