John Frank Oldfield, who went by the name "Frank Oldfield," was an early law enforcement pioneer in undercover investigations. He was one of the most famous investigators in the country, whose exploits were covered intensively by newspapers of the day.
John Frank Oldfield, who went by the name "Frank Oldfield," was an early law enforcement pioneer in undercover investigations. He was one of the most famous investigators in the country, whose exploits were covered intensively by newspapers of the day.
Source: Wikipedia "John Frank Oldfield" · CC BY-SA 4.0
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