Anyway, here are a few panels from some early Captain America stories. Forgive the smearing from the center of the book; it was the best I could do.
First up, the Red Skull shows his softer side:
(Tales of Suspense #66, Jun. 1965)
After the Red Skull gives Cap a "chemical" that puts him under the Skull's control, he gives Cap "the Final Test":
(Tales of Suspense #67, Jul. 1965)
That proves it, huh Skull?