Back to the definition, The Black Hand is responsible for the assasination of the Archduke Franz Ferdinand of Austria in Sarajevo.
A reference to the clan of assasins found in another defenition of this phrase. Also known as the Dark Brotherhood. They follow the spirit known as the Night Mother (AKA Old Lady Luck). The Dark Brotherhood only kills those who have not proven themselves worthy of living (For various reasons but mostly for murder and scamming).