In April 1940, the SS newspaper Das Schwarze Korps ran a full‑page rant accusing Superman of “poisoning American children” mocking creators Jerry Siegel and Joe Shuster for being Jewish, and fuming over a Look magazine spread in which Superman hauled Hitler and Stalin before a war‑crimes tribunal.
Extremely predictable: From day one, fascists disliked how the character championed the powerless and chastised tyrants.
The article “Jerry Siegel greift ein!” ran on 25 April 1940, page 8 of Das Schwarze Korps (the SS weekly). It fills the entire page and is reproduced and translated by the German Propaganda Archive.
https://research.calvin.edu/german-propaganda-archive/superman.htm