The coordinated Jewish Fighting Organization of Warsaw, ZOB, was formed. Vladka, a member of the Jewish Labor Bund underground, was ordered to live among the Poles outside the ghetto in order to obtain arms for our fighters' organization. More than 500 fighters were organized into 22 units. Other armed groups were also formed by other Jews. The core of the armed resistance was made up of the various illegal youth organizations: Socialists, Bundists, Communists, remnants of the pre-war.