Captain America was a recruiting poster, battling against the real Nazi super-villains while Superman was still fighting cheap gunsels, strike breakers, greedy landlords and Lex Luthor – and America was still equivocating about entering the conflict at all. No wonder Simon and Kirby’s comic book became an enormous hit, selling close to a million copies a month throughout the war. But not everyone was a fan in 1941 – according to Simon, the German American Bund and America Firsters bombarded the publisher’s offices with hate mail and obscene phone calls that screamed “Death to the Jews!” Mayor Fiorello La Guardia, a real-life superhero, called to reassure him, saying: “The city of New York will see that no harm comes to you.”

—Art Spiegelman, in “Golden age superheroes were shaped by the rise of fascism”