Greens ( Montenegrin separatists ) The Greens ( ) were a group of Montenegrin separatists , most notable for instigating the Christmas Uprising of 1919 and later for supporting the existence of the Axis client state Kingdom of Montenegro during World War II . Characteristics . The Greens drew their membership from the highland tribes ( Moračani , Piperi , and Rovci ) , the Katun clans ( Bjelice , Cetinje , Cveto , and Cuce ) , and the Herzegovinian tribes ( Nikšići and Rudinjani ) . They declared themselves as Serbs . They originally existed from 1918 to 1926 in Montenegro in the newly established Kingdom of Serbs , Croats , and Slovenes , when they supported the House of Petrović - Njegoš of Montenegro over the House of Karađorđević of Serbia , and were opposed to the mode and manner in which the south Slavic unification was implemented , resulting in the disappearance of Montenegro as a political entity . Greens tended to emphasize the key role of Montenegro in Slavhood and many favoured a federal Yugoslavia . Notable leaders of the Greens included Krsto Zrnov Popović , Jovan S . Plamenac and Novica Radović . Greens re - gathered during World War II , under the command of Krsto Zrnov Popović who in turn acted under the auspices of fascist Italy . They were organized into military unit called the Lovćen Brigade featuring four brigades that participated in the chaotic civil war raging on the ground in Montenegro and whose military activity was mostly directed against communist Partisans . After their military defeat , most of the surviving Greens members joined Partisans while some joined Ustasha and minority joined Chetniks . Name . The name of the " Greens " derives from the green voting cards that were used by the supporters the Kingdom of Montenegro at the Podgorica Assembly in 1918 . History . Christmas Uprising . The " Greens " opposed the unification of the Kingdom of Montenegro with the Kingdom of Serbia under the House of Karađorđević . With support from Italy , the Greens organised an uprising in 1919 with the aim of bringing the House of Petrović - Njegoš back to the Montenegrin throne . The rebellion failed and the rebels fled to Italy . Krsto Zrnov Popović and Novica Radović lead the uprising , along with Commander Savo Čelebić and Captain Đuro Drašković . After the unsuccessful uprising , the Greens returned , starting a guerrilla war against Serb hegemony in June . The core of the revolt was subdued in 1922 - 1923 , but low - level guerrilla resistance continued in the highlands for several more years . By 1926 , most remaining forms of armed resistance ended . However , a few groups ( most notably the militia led by Savo Raspopović ) continued engaging in sqirmishes until 1929 . Reportedly , the last rebel to lay down his arms did so on the promise that he would receive a sabre and medal from King Alexander I of Yugoslavia . World War II and their end . In World War II , the " Greens " were organized yet again in Montenegro under the command of the Fascist Italian occupation government and started a war against the Communist Partisans . Among the Montenegrin federalists , Krsto Zrnov Popović returned from exile in Italy to attempt to lead the Greens . The Greens ' forces were called the Lovćen Brigade . Soon , they were disorganized and one group of Greens joined the Partisans , while another joined the Ustasha and some even joined Chetniks . After the Partisan victory in 1945 , many leaders of the Greens were killed as the collaborators of the Italian occupation : the same Popovic was murdered in 1947 . At the same time , the Communists were killing many potential opponents all over Yugoslavia . This marked the end of the Greens . Order of Freedom of Montenegro . The Order of Freedom of Montenegro was issued by the exiled King Nikola in January 1919 . This order was mainly dedicated to the Greens .