I've seen no data on that, none.
My impression is that after Pearl Harbor, the Japanese had no serious intelligence gathering operations in Conus.
Accusations against over 100,000 interned Japanese civilians seem to have no basis in fact.
“I’ve seen no data on that, none.”
I don’t know what you mean by data, but it’s certainly no secret.
“My impression is that after Pearl Harbor, the Japanese had no serious intelligence gathering operations in Conus.”
Two lines of reply:
1. So, those who provided intelligence before Pearl Harbor get a pass? FDR should have just trusted them not to do it again?
2. Define “serious.” There were persons present in our country who were eager to provide information to the Japanese. Ham radio operators posessed equipment that could certainly have transmitted to submarines off the coast.
“Accusations against over 100,000 interned Japanese civilians seem to have no basis in fact.”
I understand that you have not come across those facts, but I hope you will keep your eyes open. I’m trying to remember if Bergamini mentioned it in Japan’s Imperial Conspiracy (1971), ISBN 0-688-01905-6, but I can’t be sure.
It might also have come up in The Enigma of Japanese Power by Karel Van Wolferen. Dang my failing memory.