Ustaše Surveillance Service

The Ustaše Surveillance Service (Croatian: Ustaška nadzorna služba, UNS) was an intelligence, counter-intelligence and political police service that operated during the existence of the Independent State of Croatia (NDH), at the time of World War II in Yugoslavia. The UNS was created by the merger of the Ustaša Intelligence Service and the Service for Concentration Camps through a law that was adopted on 16 August 1941. The UNS was dissolved by a legal provision on 21 January 1943.

From the beginning, the UNS received technical assistance and information from the German Gestapo, and its representative in Zagreb, Hans Helm, made an effort to immediately branch out a network of his own spies within the UNS, in order to completely control the work of the UNS. The UNS received significant support from the Italian secret service OVRA, and its representative in Zagreb, Ciro Verdani, again stepped in to supervise the activities of the UNS.

At the end of 1942, the leadership of the NDH agreed to dissolve the UNS (the head of the UNS, Eugen Dido Kvaternik, would write after the war that Ante Pavelić agreed to hand over complete Croatian sovereignty to Germany) and intelligence affairs were entrusted to the Gestapo. Part of the intelligence work related to the surveillance of internal political enemies continued to be carried out by the General Directorate for Public Order and Security (GRAVSIGUR), and the Minister of the Interior Andrija Artuković had a specific plan to secretly establish some kind of NDH intelligence service from the Germans.

The guards of the concentration camps in the Independent State of Croatia, the Ustaška obrana, which until then were part of the UNS, continued to operate as a separate unit after the dissolution of the UNS, under the name Ustaška obrambeni sdrug. After their commander Vjekoslav Luburić, they were also known as "Luburićevci".