George L. Herr, The Nation Behind Prison Bars
“ Probably no living man knows more intimate details about the individual members of the underworld, those who are active criminals to-day, as well as the notorious crooks of the past, than the head of the Pinkerton Detective Agency. And every crook will tell you, what every honest man who knows Mr. Pinkerton will tell you, that when he says "Yes" there [Pg 125] is no possibility that the correct answer should be "No." WILLIAM A. PINKERTON Head of the Pinkerton Detective Agency New York"I know what the average man thinks—that a real crook never turns straight. ”
