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In page The Sigismund Bell:

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Hans Frank, the governor-general of the General Government, had the Sigismund Bell rung in 1940 to celebrate the German victory over France.[6] After the death of Soviet dictator Joseph Stalin in 1953, Poland's communist authorities demanded that the bell be rung as a sign of mourning. When the cathedral's bell-ringers refused, soldiers were ordered to ring the bell instead,[3] or – depending on the source – it was rung by a group of Communist activists.[6]