In 1985, Adamowicz was posthumously bestowed the title of the Righteous Among the Nations by Yad Vashem in Jerusalem for her activities involving providing information to a number of Jewish ghettos in occupied Poland.
[citation needed] Following the German invasion of Poland, Adamowicz became a member of the underground Home Army (Armia Krajowa) as a clandestine courier.
At a meeting in Warsaw in late 1941 a decision was made to embark on this perilous effort, by the representatives of AK including Irena Adamowicz and Stanislaw Hajduk, and, on the Jewish side, by Mordechaj Anielewicz, Icchak Cukierman, Józef Kapłan and Cywia Lubetkin.
Throughout the summer of 1942 Adamowicz went on a daring trip across Poland and Lithuania to establish contact between clandestine organizations in the ghettos of Warsaw, Wilno (now Vilnius), Białystok, Kowno (now Kaunas) and Szawle (Šiauliai).
Her personal experience became a part of the book by Władysław Bartoszewski and Zofia Lewin [pl] entitled Righteous Among Nations; How Poles Helped the Jews, 1939–1945.