(See Cover) Four men collected the information, traveling across the U.S. for 15 years with the patient persistence of secret agents. They tried to be inconspicuous; they knew that they might be misunderstood.
They sought recruits in homes and prisons, saloons and parish houses, burlesque theaters and offices, then interrogated them in private. They took notes in a code which was nowhere written down, and preserved only in the memories of the four. They never traveled together, lest an accident wipe out their secret with them. Coded and catalogued, the facts were locked...
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