New York City police officer (1860–1909) who was a pioneer in the fight against organized crime; he was assassinated by the Black Hand during a ‘top secret’ mission to Sicily. Rare ALS signed “Jos. Petrosino,” one page, lightly-lined, 8 x 10, Banca Italiana letterhead, August 6, 1894. Letter to Dr. E. Harrison Griffin, in full: “I don’t know how much is the bill for services rendered to me, but I will send you fifteen Dollars ($15.00 on account. If there is any more I will pay you when I come back from the country on Sept. 1st 1894.” Petrosino adds a short postscript, “Please excuse me for delaying so long in paying you.” In fine condition.