how was the black hand formed?

Question

the group of "the black hand" killed the archduke francis ferdinand and his wife. 

Answer 1

On the pre-World War I formation of the secret Serbian society known as the Crna ruka 'Black Hand', which counted among its members Gavrilo Princip (1894-1918), the assassin of Archduke Franz Ferdinand of Austria and his duchess wife Sophie, see http://net.lib.byu.edu/estu/wwi/comment/blk-hand.html.