Another interesting read is the whole Serpo story. There is forum that has postings here:
http://lucianarchy.proboards21.com/index.cgi?board=projectserpo
FIRST time I'd read Speilberg's reporting that the government had sent him a 20 pp letter evidently agaist the film--they didn't like it.
That's when he said he knew something was going on for sure.
Then, there's Reagan's reported comment on the screening of it at the whitehouse--on how few knew it was true.