http://www.acig.org/artman/publish/article_301.shtml
At times I think I was born about 30 years too late. The aviation spy trade of the 50's and 60's holds great interest to me. While researching any new books that might be out about the subject I came across this site. It might useful to some of you.
I do find some of the intercepted aircraft interesting, a civilian aero commander aircraft peaks my curiosity.