The Lithuanian Security Police (LSP), also known as Saugumas (Lithuanian: Saugumo policija), was a local police force that operated in Nazi-occupied Lithuania from 1941 to 1944. Collaborating with the Nazi Sipo (security police) and SD (intelligence agency of the SS), the unit was directly subordinate to the German Kripo (criminal police). The LSP is a controversial unit due to its role in perpetrating the Holocaust in Lithuania, persecuting Polish resistance and communist underground.
When Soviet Union occupied Lithuania on 15 June 1940, the Lithuanian Ministry of Internal Affairs was liquidated and replaced by the Soviet NKVD. Many former employees of the Ministry were arrested and imprisoned as "enemies of the people". When Nazi Germany invaded Soviet Union on 22 June 1941, Lithuanians organized an anti-Soviet June Uprising in hopes that they could restore Lithuanian independence. Therefore, they started restoring pre-Soviet state institutions under the Provisional Government of Lithuania. On 24 June 1941, the Provisional Government recreated the pre-war Ministry of Internal Affairs with three departments – State Security, Police, and Prisons. The State Security Department headed by Vytautas Reivytis. The government asked all those who worked there prior to 15 June 1940 to report back for duty. Many of them were just released from Soviet prisons.
After the German take-over of Lithuania, it became apparent that the Germans had no intention to grant autonomy to Lithuania and the Provisional Government was dissolved on 5 August 1941. At the same time, the police and intelligence agencies recreated during the transitional period were found useful and were incorporated into the German security system. The former State Security Department was reorganised to the Lithuanian Security Police.