Alexander Blade
3 appearances across 3 restored issues — every one readable in full, free.
Amazing Stories, March 1947 — 1947 “THE BLACK BROTHERHOOD” · p.163 Read the full issue (180 pages) → 
Amazing Stories, May 1947 — 1947 “Vignettes of Famous Scientists” (feature) · p.19 Read the full issue (180 pages) → 
Amazing Stories, August 1948 — 1948 “VIGNETTES OF FAMOUS SCIENTISTS” (feature) Read the full issue (161 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.