She adopted a Christian Polish identity, allowing her to work as a courier, smuggling messages, documents and money between resistance groups based in ghettos in Poland.
She learned a wide range of languages, including Polish, Hebrew, Yiddish, German, French, English, Ukrainian and Russian.
She travelled between the various large cities, carrying messages, documents, money, weapons and instructions between the resistance groups.
[1] Late in December 1941 she and Tema Schneiderman were staying with their fellow courier Bela Hazan in Grodno, where she worked at the Gestapo headquarters.
In June 1942, Hazan, who was sent to locate her once she had lost touch with the resistance, was captured in similar fashion, also ending up in Pawiak prison.
After a short period of hard labour in the fields, Korzybrodska's language skills were noticed and she found work as an interpreter in the camp office.