The Bielski partisans were a group of Jewish partisans (an irregular military group) who fought against the Nazis during World War II. They rescued Jews from extermination. They fought against the Nazis, who had taken over Poland. They also fought against people who cooperated with the Nazis. They lived and fought around Nowogródek (Navahrudak) and Lida in Poland (now western Belarus). They were named after the Bielskis, a family of Polish Jews who led the group.