Pinkerton's National Detective Agency

ALLAN PINKERTON.

PRINCIPAL

GEO. H.BANGS, Gen'l Sup't.

CHICAGO
191 & 193 Fifth Avenue,
F. WARNER, Sup't.

NEW YORK,
66 Exchange Place,
ROB'T A. PINKERTON, Sup't.

PHILADELPHIA,
45 South Third Street,
BENJ. FRANKLIN, Sup't.

CLARENCE A. SEWARD, Attorney and Counsel for the Agency, 29 Nassau Street, New York.

Chicago, December 12/75

Fred Douglass Esq.

Chicago Ill.

Dear Sir
Allow me to present to you a fac-simile of your hero and mine, "John Brown, his soul goes marching on," yes and I have many times heard, when the troops were marching into Virginia for the first time, at the breaking out of the war; I felt a thrill pass through me, telling me that those gallant men were going to Annihilate slavery, and they did so.

John Brown's body lies buried, but even yet his soul goes marching on, for there is yet much to be done ere that soul goes to rest

Yours Truly,

Allan PinkertonPinkerton, Allan

Allan Pinkerton (1819-1884) was a Scottish-American detective, spy, abolitionist, and cooper. In 1859, he attended the secret meetings held by John Brown and Frederick Douglass in Chicago along with abolitionists John Jones and Henry O. Wagoner.