Already on September 2–3, 1939, in the beginning of the German invasion of Poland and World War II, German troops committed massacres of Poles in Łaziska Górne, Łaziska Dolne and Łaziska Średnie, killing 26, 17 and 19 people, respectively (see "Nazi crimes against the Polish nation"). On September 6, 1939, the "Freikorps" murdered seven more Poles in Łaziska Górne. Among the victims of the massacres were former insurgents of the Silesian Uprisings, activists, miners, craftsmen, workers, a teacher, local official, farmer, and also teenagers and women. The town was then occupied by Germany until 1945. Seven Polish policemen who were either born or served in Łaziska were murdered by the Russians in Tver in April–May 1940 during the large Katyn massacre. The Germans established and operated a forced labour camp for Jews in Łaziska Górne, and the E393 forced labour subcamp of the &lt;a href="Stalag%20VIII-B"&gt;Stalag VIII-B/344&lt;/a&gt; prisoner-of-war camp in Łaziska Średnie.