Karski's reports

Subsequently, he escaped from Poland to France, where he joined the recreated Polish Army, and after coming to the attention of the Polish government-in-exile due to qualities like his photographic memory, he became a courier and an investigator, travelling several times between occupied Poland and France (later, the United Kingdom).

[3] His first two reports delivered to the government in exile in 1940 were entitled "Selected political and ideological issues in Poland" and "The Jewish situation".

[4][5] Joshua D. Zimmerman called his work the "Home Army's first comprehensive report on the situation of Polish Jews".

[6] and David Engel referred to it as "the first comprehensive discussion of Jewish matters in occupied Poland to have reached the [Polish] government [in exile].

[10] Until the revelations late in the war, many Western politicians, and even some Jewish leaders, remained skeptical of Karski's reports, which were called "atrocity propaganda".