I think the American Comics Group did a fine job of using a small number of titles to keep the company afloat during both boom and bust years of comic books. It started as Better or Nedor, and its early history is documented elsewhere. You can read about it in this preview PDF of
Alter Ego #61, with a fascinating article by Michael Vance. When ACG came up with its supernatural titles,
Adventures Into the Unknown and
Forbidden Worlds, they became the two books that were their mainstays, and would take them to the end of their history in 1967.
The supernaturals, as assistant editor Norman Fruman called them, sold quite well, and ACG added
Skeleton Hand, which didn’t make the crossover to a Comics Code-approved book (probably because of its title),
Out of the Night, and a one-shot issue of
The Clutching Hand, which isn’t identified as ACG on its cover. That’s likely because ACG was trying out stories that didn’t have the boy-girl happy endings that a lot of their “horror” stories did. Fruman is listed as editor of
The Clutching Hand. According to one bio I read of Fruman, he wrote about 700 scripts for Better/Nedor/ACG.
Here are examples of the two styles, one with the happy ending, and one more typical of the horror comics from other publishers.
From
Forbidden Worlds #17 (1953), drawn by Al Camy:
From
The Clutching Hand (1954), drawn by Kenneth Landau:
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More Ken Landau, including a pre-Code story from
Out of the Night, and a story for the very last issue of
Forbidden Worlds in 1967. Just click the thumbnail.