“Chief among those who bring gray hair to the FBI men are citizens who are forever stumbling into mysterious code messages. In Iowa a woman reported that from her bathroom window she could hear a voice which was obviously transmitting some kind of code. She jotted down what she could hear: ‘O-61, B-58, N-34, G-32’ and so-on. The voice would then say, ‘That is all.’ Presently it would start again on another cipher message… It was a Bingo game several doors down.”
