Karl Mannheim was the son of one of the founders of the criminal organization Intergang.

According to rumors, Mannheim murdered his father prior to leading Intergang. As leader of Intergang, Mannheim became a powerful mobster in Metropolis due to his support from Darkseid, who supplied Intergang with Apokoliptian weaponry in order to gauge the military capabilities of Earth.

After Darkseid took control of Earth with the Anti-Life Equation, Mannheim tried to curry Darkseid's favor by having Intergang to hunt down the surviving New Gods. But Darkseid deemed Mannheim and Intergang having no further need in his plans, and he killed the mobster when an outraged Mannheim foolishly tried to raise his hand against the Dark God.



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