Thanks so much for adding the Super-Mystery Comics issues, Len.
It was interesting reading the Magno and Davey story in Super Mystery v3 #5. Some of these stories were pretty violent -- my jaw admittedly dropped when I saw the panels of horrified, screaming people being burned alive and having limbs reduced to charred cinders. Kind of reminded me of the later story where Davey investigates a crazed psychotic who is strangling kids to death that ride bicycles. Maybe this would all be considered "tame" to modern day young readers who are literally saturated with extreme violence and gore at a young age, but Golden Age books were anything but an innocent and G-rated form of entertainment (by contrast, this stuff would have never passed the 1930 Production/Hays Code in films). At least, we can admit that things didn't start rolling in terms of violent images or content with William Gaines, the freakout about his comic titles somehow being damaging to kids, and the creation of the Comics Code Authority.
Heck, in a story of the Hangman in Pep Comics, a guy gets his head chopped off with an axe.
Naturally, of course... I love these stories.