This article discusses the Serbian terrorist group “Mlada Jugoslavija”
Serbian terrorist group “Mlada Jugoslavija,” composed of agents of the dictatorship and police informers. On February 18th, the day Professor Sufflay was assassinated, Suchak’s pro-regime newspaper “Nacha Sloga” published an article full of invective against Croatian intellectuals, ending with the words: “We will fight skulls.”
Mlada Jugoslavija: A Pro-Regime Serbian Terrorist Organization in the Kingdom of Yugoslavia
In the turbulent interwar period of the Kingdom of Yugoslavia (established in 1918 as the Kingdom of Serbs, Croats, and Slovenes), ethnic tensions simmered beneath the surface of the new South Slav state.
Under King Alexander I’s increasingly centralized and authoritarian rule—culminating in the royal dictatorship declared on January 6, 1929—pro-regime forces, often dominated by Serbian nationalist elements loyal to Belgrade, employed violence and intimidation to suppress Croatian, Macedonian, and other non-Serb autonomist or nationalist voices.
One such instrument was the organization Mlada Jugoslavija (Young Yugoslavia), frequently described in historical accounts as a terrorist or semi-terrorist group composed of regime agents, police informers, and radical Yugoslav unitarists.
Origins and Role as Regime Enforcers
Mlada Jugoslavija operated as a youth auxiliary aligned with the dictatorship’s ideology of integral Yugoslavism, which in practice often meant Serbian hegemony. It enjoyed protection from high-level authorities, including police and military figures in Zagreb. Members acted as enforcers, targeting intellectuals, politicians, and activists who advocated for Croatian rights or criticized centralization from Belgrade. The group blended propaganda, street-level intimidation, and outright assassinations, functioning as a paramilitary extension of the regime’s security apparatus rather than a purely grassroots movement.
Historians link it directly to Yugoslav police structures in Croatia, portraying it as a tool for extrajudicial violence while the regime maintained plausible deniability. Its activities exemplified the broader pattern of political repression during the 6 January Dictatorship, where opposition was met with arrests, censorship, and violence.
The Assassination of Professor Milan Šufflay (February 18, 1931)
The group’s most notorious act was the brutal murder of Milan Šufflay (also spelled Sufflay), a prominent Croatian historian, politician, and one of the founders of Albanology. Šufflay, a member of the Pure Party of Rights (a right-wing Croatian nationalist group), had repeatedly criticized the Yugoslav project as a vehicle for Serbian dominance over Croatia. His scholarly work emphasized Croatia’s distinct Western European cultural heritage versus the Byzantine-influenced East, ideas that challenged unitarist narratives.
On the evening of February 18, 1931, shortly after returning from research in Albania, Šufflay was ambushed near his home on Dalmatinska Street in Zagreb. Assailants—identified in sources as members of Mlada Jugoslavija, including figures like Branko Zwerger (or Zöger) and others with ties to police—attacked him from behind and crushed his skull with an iron rod (or hammer).
The killers then reportedly broke into his apartment and stole manuscripts, including parts of his work on Codex Albanicus. Šufflay died the next day. No serious investigation followed; authorities denied involvement and restricted public mourning.
This was not a random crime but a premeditated political assassination, reportedly planned in meetings involving regime figures. It fit a pattern of targeting Croatian intellectuals.
Incitement in the Pro-Regime Press: “Naša Sloga”
The atmosphere of violence was fueled by inflammatory rhetoric in pro-regime newspapers. Naša Sloga (Our Unity), a Sušak-based (Rijeka area) pro-dictatorship paper associated with editor Suchak (or Sučak), played a direct role in the lead-up to the murder. On or around February 15–18, 1931, it published vitriolic articles attacking Croatian intellectuals.
One piece, titled variations of “Dosta nam je toga” (“We’ve Had Enough”), railed against figures like Šufflay. Crucially, on the day of the assassination (February 18), the paper ran content ending with threats such as “We will fight skulls” or “Heads will be broken/crushed” (“Padat će glave” / references to smashing skulls).
This was widely seen as incitement, providing moral cover or signaling for the attackers. The timing—articles immediately preceding and coinciding with the murder—highlighted coordination between propaganda organs and terrorist enforcers like Mlada Jugoslavija.
International Outrage and Legacy
The murder sparked global condemnation. Albert Einstein and Heinrich Mann issued a public appeal to the International League for Human Rights in Paris, denouncing the “horrible brutality” of the Yugoslav regime against Croats and directly implicating authorities in Šufflay’s death. The story made the front page of The New York Times in May 1931.
Mlada Jugoslavija exemplified how the Yugoslav dictatorship weaponized Serbian-aligned radicals and police networks to terrorize opponents. While the Kingdom of Yugoslavia presented itself as a unifying South Slav project, groups like this revealed deep ethnic fractures and the use of state-backed terrorism to maintain control. Šufflay’s assassination remains a symbol of Croatian resistance and the repressive nature of the pre-WWII Yugoslav regime.
Sources
Appeal of the Croatian Academicians to the World of Civilisation: How the Croatian Savant Professor of University Dr. Milan Sufflay was Murdered by the Serbian Royal Dictatorship. 1931. p.17. Croatian university clubs association, Zagreb.
