https://research.calvin.edu/german-prop
Fact Checkers 1941
"German magazine publishers must give particular attention to these issues in the coming months. Every means must be used, from articles to carefully selected pictures, from short commentaries to caricatures, jokes, etc.
The greatest care must be taken to avoid anything in novels, short stories, professional articles, jokes, etc., that could unsettle readers, or even have a negative effect. A foolish and provocative recipe, for example, can do more harm to morale than can be made good by hard educational work. Such things must be carefully considered."
https://research.calvin.edu/german-prop