Black room
A black room is part of a communication center (e.g. a post office) used by state officials to conduct clandestine interception and surveillance of communications.
A black room is part of a communication center (e.g. a post office) used by state officials to conduct clandestine interception and surveillance of communications.
A black room is part of a communication center (e.g. a post office) used by state officials to conduct clandestine interception and surveillance of communications.
Source: Wikipedia "Black room" · CC BY-SA 4.0
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