I'm re-reading Heinlein's Number of the Beast (1980) and the item below caught my attention....Is there a record in Heinlein's works of The Purge? Did it form the basis of any other story he wrote?
"We weren't thinking of that, Hilda. We're trying to apply Clarke's Law."
"I don't recall it. Maybe it was while I was out with mumps."
"Arthur C. Clarke," Pop told her. "Great man -- too bad he was liquidated in The Purge. Clarke defined how to make a great discovery or create a key invention.