Black Hand, symbol and name for a criminal and terroristic secret society, and especially associated with the Mafia and the Camorra. The Black Hand flourished in Sicily in the late 19th cent., and in the United States it was especially active in New York City at the beginning of the 20th cent. It is estimated that at one time 90% of New York City's Italian population was blackmailed by letters threatening death and marked with a black hand. Famous incidents associated with the Black Hand include the murder (1890) in New Orleans of chief of police Daniel Hennessy and the shooting (1909), in Palermo, Italy, of Lt. Joseph Petrosino of the New York City police.
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