Scott Payne spent 23 years with the FBI and went undercover to expose and take down some of the country's most violent criminal organizations. But one mission stands out the most to him: becoming 'Pale Horse,' and infiltrating the deadly operations of a white nationalist group known as The Base, by posing as a Nazi.

Retired FBI Special Agent Scott Payne reflects on his storied career in law enforcement and discusses some of his most harrowing undercover assignments, as detailed in his new book, Code Name: Pale Horse.

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