862.20210/1119: Telegram
The Ambassador in Brazil (Caffery) to the Secretary of State
[Received 8:36 p.m.]
966. Department’s 696, March 19. Under our guidance the police have so far today arrested 26 of the 30 persons we have indicated to them as connected with the four espionage rings operating Rio and sending clandestine wireless messages. This should paralyze their operations.
The police hope to have the other 6 [4?] by tomorrow.
All of the evidence necessary to hold them is contained in the intercepted messages. I do not perceive how the authorities can be furnished with this evidence without discreetly letting them know that it comes from intercepted messages.
Inform FBI immediately.