Extermination battalion
Extermination battalions or destruction battalions, colloquially istrebitels (истребители, "exterminators", "destroyers") abbreviated: istrebki (Russian), strybki (Ukrainian), stribai (Lithuanian), were paramilitary units under the control of NKVD in the Soviet-occupied Baltic states and western Soviet Union. They were tasked with repression and internal security on the Eastern Front and after it.