Rozka or Ruzka Korczak (1921, Płock – 1988) was a Jewish partisan leader during World War II. A Polish Jew, she served in the Fareynikte Partizaner Organizatsye and, alongside Vitka Kempner and founder Abba Kovner, assumed a leadership role[citation needed] in its successor group, the Avengers (Nakam)--the only known undefeated ghetto uprising in the history of the Holocaust.[citation needed]