Who, pray, are they?

From the context (i.e., the preceding verses in the chapter) it appears that they are the unrighteous inhabitants of the cities of Sodom and Gomorrah. Chapter 10 is addressed to Wisdom (i.e., Sophia as the book was composed in Greek originally), and gives a short summary of Genesis, alluding to Cain and Abel, then the Deluge, and finally the cities on the smoking plain. Lot's wife as a pillar of salt is mentioned, too (link).

Ceci n'est pas un seing.