Herbert Baum left his native Posen (today Poznán) as a child in 1912 and moved to Berlin. A graduate of the Technische Mittelschule Berlin, the qualified electrician was active from the mid-1920s in various left-wing Jewish youth organisations. In 1931 he joined the Communist Youth League. Under the Nazi dictatorship, he formed a network of mostly Jewish members of the workers’ movement. Following the attack on the exhibition pavilion at the Lustgarten in May 1942 (see Lustgarten Exhibition Pavilion), Baum and most of his fellow fighters were arrested and murdered. Baum himself died in prison on 11 June 1942, presumably as a result of suicide.