杨·卡尔斯基是波兰流亡政府的一名地下情报员。他向西方盟国呈交了关于欧洲犹太人所遭受的大规模屠杀的证据。他还撰写报告，揭露纳粹在华沙犹太人聚集区实施的暴行及其将犹太人驱逐至灭绝营这一事实。
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![A transport of Jewish prisoners marches through the snow from the Bauschovitz train station to Theresienstadt. [LCID: 69720]](https://encyclopedia.ushmm.org/images/large/781755a6-1ba5-4d8e-8b2b-9f25bdf3687f.jpg)