http://ruleofreason.blogspot.com/2014/02/the-fbi-between-rock-and-hard-place-of.html
A few years ago, when I was researching one of my period detective novels, The Chameleon, I had occasion to contact the Federal Bureau of Investigation for some details about the status and concerns of the FBI in 1929-1930. While the FBI history site gave me some information, it wasn’t quite enough. Because the story was about the discovery of an embryonic Nazi Bund near San Francisco, the questions I needed answers to were:
Was the Bureau of Investigation (or the BOI, as the FBI was known then) actively monitoring Nazi activities or Weimar Germany’s intelligence gathering in the U.S.? (Yes, to a limited extent.) Was the Department of Justice, under which the BOI operated, concerned about Nazi or German espionage or activism in the country? (Yes, to a limited extent.) Did it keep tabs on known Nazi sympathizers and organizations or on German intelligence operations in the country? (Yes.) Or was the Bureau more concerned with Communist activities in the country? (Yes, much more so.) For story purposes, because the novel is set in San Francisco in November 1929, where were BOI divisional headquarters? (We don’t know.)
I needed answers to these and other questions to write credibly about the BOI. I was finally able to contact someone with the FBI in Washington D.C. who scheduled a telephone conference for me with two agents: one who would answer my questions, and another who would audit the conversation but not participate. I was given their “field” names (which I no longer have a record of). The call lasted about 15 minutes. Both agents (male) seemed to be on the road during the call. It was a very cordial call, although I could sense that the one participating agent was reticent about some information concerning Communist activism in the country.
The “Yes” answers prompted me to further research, much of which is reflected in the novel.