Main Board for Serb Liberation
The Main Board for Serb Liberation (Serbian: Главни одбор за српско ослобођење/Glavni odbor za srpsko oslobođenje) was a Serb revolutionary organization, a secret society, founded in 1871, based in Kragujevac, Principality of Serbia. It sought the liberation and unification of Serb-inhabited territory in the Ottoman Empire.
Source: Wikipedia — Main Board for Serb Liberation (CC BY-SA 4.0)