The "Black Hand" was a secret military society formed in 1901 in Serbia. Its primary goal was to promote Serbian nationalism and the unification of all South Slavs. The group was known for its use of violence and terrorism to achieve political aims, often targeting those seen as enemies of Serbia. The most notable event associated with the Black Hand was the assassination of Archduke Franz Ferdinand of Austria in 1914. This act set off a chain of events that led to the outbreak of World War I. The group's activities highlighted the tensions in the Balkans and the complex web of alliances in early 20th-century Europe.