The story about the operation that the Soviet NKVD launched in August 1937 against Poles living in the Soviet Union. It was the bloodiest crime of Stalin that we did not know about for almost half a century. As a result, several times more Poles were murdered than during the Katyn Massacre.

Original video with English Subtitles: https://www.youtube.com/watch?v=f7ZWVgYI_e4

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