Sluzhba Bezpeky or SB OUN, (in Ukrainian: Служба безпеки ОУН (б), СБ ОУН) was the Ukrainian partisan underground intelligence service,[1] and a division of the Organization of Ukrainian Nationalists responsible for clandestine operations and anti-espionage during World War II. In its short history, the SB committed acts of terror against civilians and non-civilians and their families, including people suspected either of collaborating, or serving with the Soviet forces in western Ukraine. In this capacity, the SB also played a significant role in the ethnic cleansing and killing of the Polish population in Volhynia and Galicia.[2][3]
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