This month, as every month, the 1,508,000 copies of terror magazines, known to the trade as the shudder group, will be sold throughout the nation… They will contain enough illustrated sex perversion to give Krafft-Ebing the unholy jitters.[3]

Bruce Henry, The American Mercury, April 1938; quoted in Jones, The Shudder Pulps, pp. 138–39. [see wikipedia ‘Weird Menace’]