American Nazis were so pissed about this cover that they soon started bombarding the offices of Joe Simon and Jack Kirby with hate mail, obscene phone calls, and death threats. ("I once got a letter from a Nazi who told me to pick out any lamppost I wanted on Times Square, because when Hitler arrived, they'd hang me from it.") It was only after they started stalking Simon and Kirby that the mayor stepped in to offer the pair around-the-clock police protection, saying, "You boys over there are doing a good job. The city of New York will see that no harm will come to you." It's not as if the boys were completely defenseless, however, as Kirby's response to one unwelcome visitor demonstrates:
"On occasion the Timely office would get phone calls and letters from Nazi sympathizers threatening the creators of Captain America. Once, while Jack was in the Timely office, a call came from someone in the lobby. When Kirby answered, the caller threatened Jack with bodily harm if he showed his face. Kirby told the caller he would be right down, but by the time Jack reached street level, there was no one to be found."
We can't know exactly what Kirby and Simon's reaction to today's current political situation would be, but we're pretty sure that they'd be proud that Captain America is still giving racists stress headaches.