Usually, the toughest part of the job is stating the problem clearly, and the solution is then easy. This time the FBI could state the problem easily; solving it, though was not. How do you catch a telepathic spy?
In 1914, it was enemy aliens.
In 1930, it was Wobblies.
In 1957, it was fellow travelers.
And, in 1971....
Gör som tusentals andra bokälskare
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