Most of the Jews were deported to extermination camps via Westerbork. Some Jews were initially imprisoned in the Amersfoort or Vught camps. Amersfoort became operational in August 1941. It held mainly political prisoners: resistance fighters, communists, and persons caught in hiding. Men who evaded mandatory Arbeidsinzet were also interned in these camps. Amersfoort camp held a relatively small number of Jews, who were mostly arrested for violating the anti-Jewish measures.